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 PAGETABLE_LEVELS > 2 81static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 82{ 83 return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); 84} 85 86static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 87{ 88 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); 89 free_page((unsigned long)pmd); 90} 91 92extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd); 93 94static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd, 95 unsigned long adddress) 96{ 97 ___pmd_free_tlb(tlb, pmd); 98} 99 100#ifdef CONFIG_X86_PAE 101extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd); 102#else /* !CONFIG_X86_PAE */ 103static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 104{ 105 paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); 106 set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd))); 107} 108#endif /* CONFIG_X86_PAE */ 109 110#if PAGETABLE_LEVELS > 3 111static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud) 112{ 113 paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT); 114 set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud))); 115} 116 117static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 118{ 119 return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT); 120} 121 122static inline void pud_free(struct mm_struct *mm, pud_t *pud) 123{ 124 BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); 125 free_page((unsigned long)pud); 126} 127 128extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud); 129 130static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud, 131 unsigned long address) 132{ 133 ___pud_free_tlb(tlb, pud); 134} 135 136#endif /* PAGETABLE_LEVELS > 3 */ 137#endif /* PAGETABLE_LEVELS > 2 */ 138 139#endif /* _ASM_X86_PGALLOC_H */ 140