include/asm-x86/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 #ifdef CONFIG_PARAVIRT
   9 #include <asm/paravirt.h>
  10 #else
  11 static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)  {}
  12 static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)  {}
  13 static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn,
  14                                             unsigned long start, unsigned long count) {}
  15 static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)  {}
  16 static inline void paravirt_release_pte(unsigned long pfn) {}
  17 static inline void paravirt_release_pmd(unsigned long pfn) {}
  18 static inline void paravirt_release_pud(unsigned long pfn) {}
  19 #endif
  20
  21 /*
  22  * Allocate and free page tables.
  23  */
  24 extern pgd_t *pgd_alloc(struct mm_struct *);
  25 extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
  26
  27 extern pte_t *pte_alloc_one_kernel(struct mm_struct *, unsigned long);
  28 extern pgtable_t pte_alloc_one(struct mm_struct *, unsigned long);
  29
  30 /* Should really implement gc for free page table pages. This could be
  31    done with a reference count in struct page. */
  32
  33 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  34 {
  35         BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
  36         free_page((unsigned long)pte);
  37 }
  38
  39 static inline void pte_free(struct mm_struct *mm, struct page *pte)
  40 {
  41         __free_page(pte);
  42 }
  43
  44 extern void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte);
  45
  46 static inline void pmd_populate_kernel(struct mm_struct *mm,
  47                                        pmd_t *pmd, pte_t *pte)
  48 {
  49         paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT);
  50         set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
  51 }
  52
  53 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
  54                                 struct page *pte)
  55 {
  56         unsigned long pfn = page_to_pfn(pte);
  57
  58         paravirt_alloc_pte(mm, pfn);
  59         set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE));
  60 }
  61
  62 #define pmd_pgtable(pmd) pmd_page(pmd)
  63
  64 #if PAGETABLE_LEVELS > 2
  65 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  66 {
  67         return (pmd_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  68 }
  69
  70 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  71 {
  72         BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
  73         free_page((unsigned long)pmd);
  74 }
  75
  76 extern void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
  77
  78 #ifdef CONFIG_X86_PAE
  79 extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
  80 #else   /* !CONFIG_X86_PAE */
  81 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  82 {
  83         paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT);
  84         set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd)));
  85 }
  86 #endif  /* CONFIG_X86_PAE */
  87
  88 #if PAGETABLE_LEVELS > 3
  89 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
  90 {
  91         paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT);
  92         set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(pud)));
  93 }
  94
  95 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  96 {
  97         return (pud_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
  98 }
  99
 100 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 101 {
 102         BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
 103         free_page((unsigned long)pud);
 104 }
 105
 106 extern void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud);
 107 #endif  /* PAGETABLE_LEVELS > 3 */
 108 #endif  /* PAGETABLE_LEVELS > 2 */
 109
 110 #endif  /* _ASM_X86_PGALLOC_H */