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  * 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         pgtable_page_dtor(pte);
  46         __free_page(pte);
  47 }
  48
  49 extern void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
  50
  51 static inline void pmd_populate_kernel(struct mm_struct *mm,
  52                                        pmd_t *pmd, pte_t *pte)
  53 {
  54         paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
  55         set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
  56 }
  57
  58 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  59                                 struct page *pte)
  60 {
  61         unsigned long pfn = page_to_pfn(pte);
  62
  63         paravirt_alloc_pte(mm, pfn);
  64         set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
  65 }
  66
  67 #define pmd_pgtable(pmd) pmd_page(pmd)
  68
  69 #if PAGETABLE_LEVELS > 2
  70 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  71 {
  72         return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  73 }
  74
  75 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  76 {
  77         BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
  78         free_page((unsigned long)pmd);
  79 }
  80
  81 extern void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
  82
  83 #ifdef CONFIG_X86_PAE
  84 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
  85 #else   /* !CONFIG_X86_PAE */
  86 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  87 {
  88         paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
  89         set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
  90 }
  91 #endif  /* CONFIG_X86_PAE */
  92
  93 #if PAGETABLE_LEVELS > 3
  94 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
  95 {
  96         paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
  97         set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));
  98 }
  99
 100 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
 101 {
 102         return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
 103 }
 104
 105 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 106 {
 107         BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
 108         free_page((unsigned long)pud);
 109 }
 110
 111 extern void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
 112 #endif  /* PAGETABLE_LEVELS > 3 */
 113 #endif  /* PAGETABLE_LEVELS > 2 */
 114
 115 #endif /* _ASM_X86_PGALLOC_H */