arch/x86/include/asm/pgalloc.h

   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_REPEAT | __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|__GFP_REPEAT);
 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 */