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