1 #ifndef _ASM_X86_PGALLOC_H
2 #define _ASM_X86_PGALLOC_H
4 #include <linux/threads.h>
5 #include <linux/mm.h> /* for struct page */
6 #include <linux/pagemap.h>
9 #include <asm/paravirt.h>
11 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {}
12 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {}
13 static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
14 unsigned long start, unsigned long count) {}
15 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {}
16 static inline void paravirt_release_pte(unsigned long pfn) {}
17 static inline void paravirt_release_pmd(unsigned long pfn) {}
18 static inline void paravirt_release_pud(unsigned long pfn) {}
22 * Allocate and free page tables.
24 extern pgd_t *pgd_alloc(struct mm_struct *);
25 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
27 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
28 extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
30 /* Should really implement gc for free page table pages. This could be
31 done with a reference count in struct page. */
33 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
35 BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
36 free_page((unsigned long)pte);
39 static inline void pte_free(struct mm_struct *mm, struct page *pte)
44 extern void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
46 static inline void pmd_populate_kernel(struct mm_struct *mm,
47 pmd_t *pmd, pte_t *pte)
49 paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
50 set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
53 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
56 unsigned long pfn = page_to_pfn(pte);
58 paravirt_alloc_pte(mm, pfn);
59 set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
62 #define pmd_pgtable(pmd) pmd_page(pmd)
64 #if PAGETABLE_LEVELS > 2
65 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
67 return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
70 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
72 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
73 free_page((unsigned long)pmd);
76 extern void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
79 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
80 #else /* !CONFIG_X86_PAE */
81 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
83 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
84 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
86 #endif /* CONFIG_X86_PAE */
88 #if PAGETABLE_LEVELS > 3
89 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
91 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
92 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));
95 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
97 return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
100 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
102 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
103 free_page((unsigned long)pud);
106 extern void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
107 #endif /* PAGETABLE_LEVELS > 3 */
108 #endif /* PAGETABLE_LEVELS > 2 */
110 #endif /* _ASM_X86_PGALLOC_H */