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Jeremy Fitzhardinge4f76cd32008-03-17 16:36:55 -07001#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
Jeremy Fitzhardinge1d262d32008-03-17 16:36:56 -07008#ifdef CONFIG_PARAVIRT
9#include <asm/paravirt.h>
10#else
Jeremy Fitzhardinge286cd492008-03-17 16:37:06 -070011static 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) {}
Jeremy Fitzhardinge1d262d32008-03-17 16:36:56 -070019#endif
20
Jeremy Fitzhardinge4f76cd32008-03-17 16:36:55 -070021/*
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
Jeremy Fitzhardinge397f6872008-03-17 16:36:57 -070030/* 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
Jeremy Fitzhardinge170fdff2008-03-17 16:36:58 -070046static inline void pmd_populate_kernel(struct mm_struct *mm,
47 pmd_t *pmd, pte_t *pte)
48{
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -070049 paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
Jeremy Fitzhardinge170fdff2008-03-17 16:36:58 -070050 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
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -070058 paravirt_alloc_pte(mm, pfn);
Jeremy Fitzhardinge170fdff2008-03-17 16:36:58 -070059 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);
Jeremy Fitzhardinge170fdff2008-03-17 16:36:58 -070077
Jeremy Fitzhardinge5a5f8f42008-03-17 16:36:59 -070078#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{
Jeremy Fitzhardinge6944a9c2008-03-17 16:37:01 -070083 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
Jeremy Fitzhardinge5a5f8f42008-03-17 16:36:59 -070084 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{
Jeremy Fitzhardinge2761fa02008-03-17 16:37:02 -070091 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
Jeremy Fitzhardinge5a5f8f42008-03-17 16:36:59 -070092 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 */
Jeremy Fitzhardinge4f76cd32008-03-17 16:36:55 -0700109
110#endif /* _ASM_X86_PGALLOC_H */