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