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 * Flags to use when allocating a user page table page.
27 */
28extern gfp_t __userpte_alloc_gfp;
29
30/*
31 * Allocate and free page tables.
32 */
33extern pgd_t *pgd_alloc(struct mm_struct *);
34extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
35
36extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
37extern 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
42static 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
48static inline void pte_free(struct mm_struct *mm, struct page *pte)
49{
50 pgtable_page_dtor(pte);
51 __free_page(pte);
52}
53
54extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
55
56static 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
62static 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
69static 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 CONFIG_PGTABLE_LEVELS > 2
81static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
82{
83 struct page *page;
84 gfp_t gfp = GFP_KERNEL_ACCOUNT | __GFP_ZERO;
85
86 if (mm == &init_mm)
87 gfp &= ~__GFP_ACCOUNT;
88 page = alloc_pages(gfp, 0);
89 if (!page)
90 return NULL;
91 if (!pgtable_pmd_page_ctor(page)) {
92 __free_pages(page, 0);
93 return NULL;
94 }
95 return (pmd_t *)page_address(page);
96}
97
98static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
99{
100 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
101 pgtable_pmd_page_dtor(virt_to_page(pmd));
102 free_page((unsigned long)pmd);
103}
104
105extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
106
107static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
108 unsigned long address)
109{
110 ___pmd_free_tlb(tlb, pmd);
111}
112
113#ifdef CONFIG_X86_PAE
114extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
115#else /* !CONFIG_X86_PAE */
116static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
117{
118 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
119 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
120}
121#endif /* CONFIG_X86_PAE */
122
123#if CONFIG_PGTABLE_LEVELS > 3
124static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
125{
126 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
127 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));
128}
129
130static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
131{
132 gfp_t gfp = GFP_KERNEL_ACCOUNT;
133
134 if (mm == &init_mm)
135 gfp &= ~__GFP_ACCOUNT;
136 return (pud_t *)get_zeroed_page(gfp);
137}
138
139static inline void pud_free(struct mm_struct *mm, pud_t *pud)
140{
141 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
142 free_page((unsigned long)pud);
143}
144
145extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
146
147static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
148 unsigned long address)
149{
150 ___pud_free_tlb(tlb, pud);
151}
152
153#endif /* CONFIG_PGTABLE_LEVELS > 3 */
154#endif /* CONFIG_PGTABLE_LEVELS > 2 */
155
156#endif /* _ASM_X86_PGALLOC_H */