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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 | * 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 | __free_page(pte); | |
46 | } | |
47 | ||
48 | extern void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte); | |
49 | ||
50 | static inline void pmd_populate_kernel(struct mm_struct *mm, | |
51 | pmd_t *pmd, pte_t *pte) | |
52 | { | |
53 | paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT); | |
54 | set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE)); | |
55 | } | |
56 | ||
57 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, | |
58 | struct page *pte) | |
59 | { | |
60 | unsigned long pfn = page_to_pfn(pte); | |
61 | ||
62 | paravirt_alloc_pte(mm, pfn); | |
63 | set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE)); | |
64 | } | |
65 | ||
66 | #define pmd_pgtable(pmd) pmd_page(pmd) | |
67 | ||
68 | #if PAGETABLE_LEVELS > 2 | |
69 | static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) | |
70 | { | |
71 | return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); | |
72 | } | |
73 | ||
74 | static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) | |
75 | { | |
76 | BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); | |
77 | free_page((unsigned long)pmd); | |
78 | } | |
79 | ||
80 | extern void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd); | |
81 | ||
82 | #ifdef CONFIG_X86_PAE | |
83 | extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd); | |
84 | #else /* !CONFIG_X86_PAE */ | |
85 | static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) | |
86 | { | |
87 | paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); | |
88 | set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd))); | |
89 | } | |
90 | #endif /* CONFIG_X86_PAE */ | |
91 | ||
92 | #if PAGETABLE_LEVELS > 3 | |
93 | static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) | |
94 | { | |
95 | paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT); | |
96 | set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud))); | |
97 | } | |
98 | ||
99 | static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) | |
100 | { | |
101 | return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); | |
102 | } | |
103 | ||
104 | static inline void pud_free(struct mm_struct *mm, pud_t *pud) | |
105 | { | |
106 | BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); | |
107 | free_page((unsigned long)pud); | |
108 | } | |
109 | ||
110 | extern void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud); | |
111 | #endif /* PAGETABLE_LEVELS > 3 */ | |
112 | #endif /* PAGETABLE_LEVELS > 2 */ | |
113 | ||
114 | #endif /* _ASM_X86_PGALLOC_H */ |