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pgalloc.h
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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  * Flags to use when allocating a user page table page.
27  */
28 extern gfp_t __userpte_alloc_gfp;
29 
30 /*
31  * Allocate and free page tables.
32  */
33 extern pgd_t *pgd_alloc(struct mm_struct *);
34 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
35 
36 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
37 extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
38 
39 /* Should really implement gc for free page table pages. This could be
40  done with a reference count in struct page. */
41 
42 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
43 {
44  BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
45  free_page((unsigned long)pte);
46 }
47 
48 static inline void pte_free(struct mm_struct *mm, struct page *pte)
49 {
50  pgtable_page_dtor(pte);
51  __free_page(pte);
52 }
53 
54 extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
55 
56 static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
57  unsigned long address)
58 {
59  ___pte_free_tlb(tlb, pte);
60 }
61 
62 static inline void pmd_populate_kernel(struct mm_struct *mm,
63  pmd_t *pmd, pte_t *pte)
64 {
65  paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
66  set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
67 }
68 
69 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
70  struct page *pte)
71 {
72  unsigned long pfn = page_to_pfn(pte);
73 
74  paravirt_alloc_pte(mm, pfn);
75  set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
76 }
77 
78 #define pmd_pgtable(pmd) pmd_page(pmd)
79 
80 #if PAGETABLE_LEVELS > 2
81 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
82 {
83  return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
84 }
85 
86 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
87 {
88  BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
89  free_page((unsigned long)pmd);
90 }
91 
92 extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
93 
94 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
95  unsigned long address)
96 {
97  ___pmd_free_tlb(tlb, pmd);
98 }
99 
100 #ifdef CONFIG_X86_PAE
101 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
102 #else /* !CONFIG_X86_PAE */
103 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
104 {
105  paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
106  set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
107 }
108 #endif /* CONFIG_X86_PAE */
109 
110 #if PAGETABLE_LEVELS > 3
111 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
112 {
113  paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
114  set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));
115 }
116 
117 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
118 {
119  return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
120 }
121 
122 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
123 {
124  BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
125  free_page((unsigned long)pud);
126 }
127 
128 extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
129 
130 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
131  unsigned long address)
132 {
133  ___pud_free_tlb(tlb, pud);
134 }
135 
136 #endif /* PAGETABLE_LEVELS > 3 */
137 #endif /* PAGETABLE_LEVELS > 2 */
138 
139 #endif /* _ASM_X86_PGALLOC_H */
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