arch/metag/include/asm/pgalloc.h

   1 #ifndef _METAG_PGALLOC_H
   2 #define _METAG_PGALLOC_H
   3
   4 #include <linux/threads.h>
   5 #include <linux/mm.h>
   6
   7 #define pmd_populate_kernel(mm, pmd, pte) \
   8         set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)))
   9
  10 #define pmd_populate(mm, pmd, pte) \
  11         set_pmd(pmd, __pmd(_PAGE_TABLE | page_to_phys(pte)))
  12
  13 #define pmd_pgtable(pmd) pmd_page(pmd)
  14
  15 /*
  16  * Allocate and free page tables.
  17  */
  18 #ifdef CONFIG_METAG_META21_MMU
  19 static inline void pgd_ctor(pgd_t *pgd)
  20 {
  21         memcpy(pgd + USER_PTRS_PER_PGD,
  22                swapper_pg_dir + USER_PTRS_PER_PGD,
  23                (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
  24 }
  25 #else
  26 #define pgd_ctor(x)     do { } while (0)
  27 #endif
  28
  29 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  30 {
  31         pgd_t *pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
  32         if (pgd)
  33                 pgd_ctor(pgd);
  34         return pgd;
  35 }
  36
  37 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  38 {
  39         free_page((unsigned long)pgd);
  40 }
  41
  42 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  43                                           unsigned long address)
  44 {
  45         pte_t *pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
  46         return pte;
  47 }
  48
  49 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  50                                       unsigned long address)
  51 {
  52         struct page *pte;
  53         pte = alloc_pages(GFP_KERNEL  | __GFP_ZERO, 0);
  54         if (!pte)
  55                 return NULL;
  56         if (!pgtable_page_ctor(pte)) {
  57                 __free_page(pte);
  58                 return NULL;
  59         }
  60         return pte;
  61 }
  62
  63 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  64 {
  65         free_page((unsigned long)pte);
  66 }
  67
  68 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
  69 {
  70         pgtable_page_dtor(pte);
  71         __free_page(pte);
  72 }
  73
  74 #define __pte_free_tlb(tlb, pte, addr)                          \
  75         do {                                                    \
  76                 pgtable_page_dtor(pte);                         \
  77                 tlb_remove_page((tlb), (pte));                  \
  78         } while (0)
  79
  80 #define check_pgt_cache()       do { } while (0)
  81
  82 #endif