Linux kernel mirror (for testing)
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linux
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
8static 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)
14static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {}
15static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
16static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
17static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
18 unsigned long start, unsigned long count) {}
19static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
20static inline void paravirt_release_pte(unsigned long pfn) {}
21static inline void paravirt_release_pmd(unsigned long pfn) {}
22static inline void paravirt_release_pud(unsigned long pfn) {}
23#endif
24
25/*
26 * Allocate and free page tables.
27 */
28extern pgd_t *pgd_alloc(struct mm_struct *);
29extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
30
31extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
32extern 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
37static 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
43static inline void pte_free(struct mm_struct *mm, struct page *pte)
44{
45 __free_page(pte);
46}
47
48extern void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
49
50static 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
57static 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
69static 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
74static 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
80extern void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
81
82#ifdef CONFIG_X86_PAE
83extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
84#else /* !CONFIG_X86_PAE */
85static 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
93static 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
99static 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
104static 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
110extern 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 */