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 static 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) 14 static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {} 15 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {} 16 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {} 17 static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn, 18 unsigned long start, unsigned long count) {} 19 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {} 20 static inline void paravirt_release_pte(unsigned long pfn) {} 21 static inline void paravirt_release_pmd(unsigned long pfn) {} 22 static inline void paravirt_release_pud(unsigned long pfn) {} 23 #endif 24 25 /* 26 * Allocate and free page tables. 27 */ 28 extern pgd_t *pgd_alloc(struct mm_struct *); 29 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); 30 31 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long); 32 extern 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 37 static 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 43 static inline void pte_free(struct mm_struct *mm, struct page *pte) 44 { 45 __free_page(pte); 46 } 47 48 extern void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte); 49 50 static 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 57 static 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 69 static 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 74 static 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 80 extern void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd); 81 82 #ifdef CONFIG_X86_PAE 83 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd); 84 #else /* !CONFIG_X86_PAE */ 85 static 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 93 static 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 99 static 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 } 103 104 static 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 } 109 110 extern 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 */ 115