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Linux/arch/metag/include/asm/pgalloc.h

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  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_REPEAT |
 46                                               __GFP_ZERO);
 47         return pte;
 48 }
 49 
 50 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
 51                                       unsigned long address)
 52 {
 53         struct page *pte;
 54         pte = alloc_pages(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO, 0);
 55         if (!pte)
 56                 return NULL;
 57         if (!pgtable_page_ctor(pte)) {
 58                 __free_page(pte);
 59                 return NULL;
 60         }
 61         return pte;
 62 }
 63 
 64 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 65 {
 66         free_page((unsigned long)pte);
 67 }
 68 
 69 static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
 70 {
 71         pgtable_page_dtor(pte);
 72         __free_page(pte);
 73 }
 74 
 75 #define __pte_free_tlb(tlb, pte, addr)                          \
 76         do {                                                    \
 77                 pgtable_page_dtor(pte);                         \
 78                 tlb_remove_page((tlb), (pte));                  \
 79         } while (0)
 80 
 81 #define check_pgt_cache()       do { } while (0)
 82 
 83 #endif
 84 

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