arch/m68k/include/asm/sun3_pgalloc.h

   1 /* sun3_pgalloc.h --
   2  * reorganization around 2.3.39, routines moved from sun3_pgtable.h
   3  *
   4  *
   5  * 02/27/2002 -- Modified to support "highpte" implementation in 2.5.5 (Sam)
   6  *
   7  * moved 1/26/2000 Sam Creasey
   8  */
   9
  10 #ifndef _SUN3_PGALLOC_H
  11 #define _SUN3_PGALLOC_H
  12
  13 #include <asm/tlb.h>
  14
  15 extern const char bad_pmd_string[];
  16
  17 #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
  18
  19
  20 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  21 {
  22         free_page((unsigned long) pte);
  23 }
  24
  25 static inline void pte_free(struct mm_struct *mm, pgtable_t page)
  26 {
  27         pgtable_page_dtor(page);
  28         __free_page(page);
  29 }
  30
  31 #define __pte_free_tlb(tlb,pte,addr)                    \
  32 do {                                                    \
  33         pgtable_page_dtor(pte);                         \
  34         tlb_remove_page((tlb), pte);                    \
  35 } while (0)
  36
  37 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  38                                           unsigned long address)
  39 {
  40         unsigned long page = __get_free_page(GFP_KERNEL);
  41
  42         if (!page)
  43                 return NULL;
  44
  45         memset((void *)page, 0, PAGE_SIZE);
  46         return (pte_t *) (page);
  47 }
  48
  49 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  50                                         unsigned long address)
  51 {
  52         struct page *page = alloc_pages(GFP_KERNEL, 0);
  53
  54         if (page == NULL)
  55                 return NULL;
  56
  57         clear_highpage(page);
  58         if (!pgtable_page_ctor(page)) {
  59                 __free_page(page);
  60                 return NULL;
  61         }
  62         return page;
  63
  64 }
  65
  66 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
  67 {
  68         pmd_val(*pmd) = __pa((unsigned long)pte);
  69 }
  70
  71 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
  72 {
  73         pmd_val(*pmd) = __pa((unsigned long)page_address(page));
  74 }
  75 #define pmd_pgtable(pmd) pmd_page(pmd)
  76
  77 /*
  78  * allocating and freeing a pmd is trivial: the 1-entry pmd is
  79  * inside the pgd, so has no extra memory associated with it.
  80  */
  81 #define pmd_free(mm, x)                 do { } while (0)
  82 #define __pmd_free_tlb(tlb, x, addr)    do { } while (0)
  83
  84 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  85 {
  86         free_page((unsigned long) pgd);
  87 }
  88
  89 static inline pgd_t * pgd_alloc(struct mm_struct *mm)
  90 {
  91      pgd_t *new_pgd;
  92
  93      new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
  94      memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
  95      memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
  96      return new_pgd;
  97 }
  98
  99 #define pgd_populate(mm, pmd, pte) BUG()
 100
 101 #endif /* SUN3_PGALLOC_H */