release/src-rt-6.x.4708/linux/linux-2.6.36/arch/alpha/include/asm/pgalloc.h

   1 #ifndef _ALPHA_PGALLOC_H
   2 #define _ALPHA_PGALLOC_H
   3
   4 #include <linux/mm.h>
   5 #include <linux/mmzone.h>
   6
   7 /*
   8  * Allocate and free page tables. The xxx_kernel() versions are
   9  * used to allocate a kernel page table - this turns on ASN bits
  10  * if any.
  11  */
  12
  13 static inline void
  14 pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t pte)
  15 {
  16         pmd_set(pmd, (pte_t *)(page_to_pa(pte) + PAGE_OFFSET));
  17 }
  18 #define pmd_pgtable(pmd) pmd_page(pmd)
  19
  20 static inline void
  21 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
  22 {
  23         pmd_set(pmd, pte);
  24 }
  25
  26 static inline void
  27 pgd_populate(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmd)
  28 {
  29         pgd_set(pgd, pmd);
  30 }
  31
  32 extern pgd_t *pgd_alloc(struct mm_struct *mm);
  33
  34 static inline void
  35 pgd_free(struct mm_struct *mm, pgd_t *pgd)
  36 {
  37         free_page((unsigned long)pgd);
  38 }
  39
  40 static inline pmd_t *
  41 pmd_alloc_one(struct mm_struct *mm, unsigned long address)
  42 {
  43         pmd_t *ret = (pmd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
  44         return ret;
  45 }
  46
  47 static inline void
  48 pmd_free(struct mm_struct *mm, pmd_t *pmd)
  49 {
  50         free_page((unsigned long)pmd);
  51 }
  52
  53 static inline pte_t *
  54 pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
  55 {
  56         pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
  57         return pte;
  58 }
  59
  60 static inline void
  61 pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  62 {
  63         free_page((unsigned long)pte);
  64 }
  65
  66 static inline pgtable_t
  67 pte_alloc_one(struct mm_struct *mm, unsigned long address)
  68 {
  69         pte_t *pte = pte_alloc_one_kernel(mm, address);
  70         struct page *page;
  71
  72         if (!pte)
  73                 return NULL;
  74         page = virt_to_page(pte);
  75         pgtable_page_ctor(page);
  76         return page;
  77 }
  78
  79 static inline void
  80 pte_free(struct mm_struct *mm, pgtable_t page)
  81 {
  82         pgtable_page_dtor(page);
  83         __free_page(page);
  84 }
  85
  86 #define check_pgt_cache()       do { } while (0)
  87
  88 #endif /* _ALPHA_PGALLOC_H */