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 /* FIXME - when we get this compiling */
  16 /* erm, now that it's compiling, what do we do with it? */
  17 #define _KERNPG_TABLE 0
  18
  19 extern const char bad_pmd_string[];
  20
  21 #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
  22
  23
  24 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  25 {
  26         free_page((unsigned long) pte);
  27 }
  28
  29 static inline void pte_free(struct mm_struct *mm, pgtable_t page)
  30 {
  31         pgtable_page_dtor(page);
  32         __free_page(page);
  33 }
  34
  35 #define __pte_free_tlb(tlb,pte,addr)                    \
  36 do {                                                    \
  37         pgtable_page_dtor(pte);                         \
  38         tlb_remove_page((tlb), pte);                    \
  39 } while (0)
  40
  41 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  42                                           unsigned long address)
  43 {
  44         unsigned long page = __get_free_page(GFP_KERNEL|__GFP_REPEAT);
  45
  46         if (!page)
  47                 return NULL;
  48
  49         memset((void *)page, 0, PAGE_SIZE);
  50         return (pte_t *) (page);
  51 }
  52
  53 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  54                                         unsigned long address)
  55 {
  56         struct page *page = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
  57
  58         if (page == NULL)
  59                 return NULL;
  60
  61         clear_highpage(page);
  62         pgtable_page_ctor(page);
  63         return page;
  64
  65 }
  66
  67 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
  68 {
  69         pmd_val(*pmd) = __pa((unsigned long)pte);
  70 }
  71
  72 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page)
  73 {
  74         pmd_val(*pmd) = __pa((unsigned long)page_address(page));
  75 }
  76 #define pmd_pgtable(pmd) pmd_page(pmd)
  77
  78 /*
  79  * allocating and freeing a pmd is trivial: the 1-entry pmd is
  80  * inside the pgd, so has no extra memory associated with it.
  81  */
  82 #define pmd_free(mm, x)                 do { } while (0)
  83 #define __pmd_free_tlb(tlb, x, addr)    do { } while (0)
  84
  85 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  86 {
  87         free_page((unsigned long) pgd);
  88 }
  89
  90 static inline pgd_t * pgd_alloc(struct mm_struct *mm)
  91 {
  92      pgd_t *new_pgd;
  93
  94      new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
  95      memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
  96      memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
  97      return new_pgd;
  98 }
  99
 100 #define pgd_populate(mm, pmd, pte) BUG()
 101
 102 #endif /* SUN3_PGALLOC_H */