arch/m68k/include/asm/mcf_pgalloc.h

   1 #ifndef M68K_MCF_PGALLOC_H
   2 #define M68K_MCF_PGALLOC_H
   3
   4 #include <asm/tlb.h>
   5 #include <asm/tlbflush.h>
   6
   7 extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
   8 {
   9         free_page((unsigned long) pte);
  10 }
  11
  12 extern const char bad_pmd_string[];
  13
  14 extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  15         unsigned long address)
  16 {
  17         unsigned long page = __get_free_page(GFP_DMA|__GFP_REPEAT);
  18
  19         if (!page)
  20                 return NULL;
  21
  22         memset((void *)page, 0, PAGE_SIZE);
  23         return (pte_t *) (page);
  24 }
  25
  26 extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
  27 {
  28         return (pmd_t *) pgd;
  29 }
  30
  31 #define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
  32 #define pmd_alloc_one(mm, address)      ({ BUG(); ((pmd_t *)2); })
  33
  34 #define pte_alloc_one_fast(mm, addr) pte_alloc_one(mm, addr)
  35
  36 #define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
  37         (unsigned long)(page_address(page)))
  38
  39 #define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
  40
  41 #define pmd_pgtable(pmd) pmd_page(pmd)
  42
  43 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
  44                                   unsigned long address)
  45 {
  46         __free_page(page);
  47 }
  48
  49 #define __pmd_free_tlb(tlb, pmd, address) do { } while (0)
  50
  51 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  52         unsigned long address)
  53 {
  54         struct page *page = alloc_pages(GFP_DMA|__GFP_REPEAT, 0);
  55         pte_t *pte;
  56
  57         if (!page)
  58                 return NULL;
  59         if (!pgtable_page_ctor(page)) {
  60                 __free_page(page);
  61                 return NULL;
  62         }
  63
  64         pte = kmap(page);
  65         if (pte) {
  66                 clear_page(pte);
  67                 __flush_page_to_ram(pte);
  68                 flush_tlb_kernel_page(pte);
  69                 nocache_page(pte);
  70         }
  71         kunmap(page);
  72
  73         return page;
  74 }
  75
  76 extern inline void pte_free(struct mm_struct *mm, struct page *page)
  77 {
  78         __free_page(page);
  79 }
  80
  81 /*
  82  * In our implementation, each pgd entry contains 1 pmd that is never allocated
  83  * or freed.  pgd_present is always 1, so this should never be called. -NL
  84  */
  85 #define pmd_free(mm, pmd) BUG()
  86
  87 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  88 {
  89         free_page((unsigned long) pgd);
  90 }
  91
  92 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  93 {
  94         pgd_t *new_pgd;
  95
  96         new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
  97         if (!new_pgd)
  98                 return NULL;
  99         memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
 100         memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
 101         return new_pgd;
 102 }
 103
 104 #define pgd_populate(mm, pmd, pte) BUG()
 105
 106 #endif /* M68K_MCF_PGALLOC_H */