include/asm-m68k/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(pte_t * pte)
  25 {
  26         free_page((unsigned long) pte);
  27 }
  28
  29 static inline void pte_free(struct page *page)
  30 {
  31         __free_page(page);
  32 }
  33
  34 #define __pte_free_tlb(tlb,pte) tlb_remove_page((tlb),(pte))
  35
  36 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  37                                           unsigned long address)
  38 {
  39         unsigned long page = __get_free_page(GFP_KERNEL|__GFP_REPEAT);
  40
  41         if (!page)
  42                 return NULL;
  43
  44         memset((void *)page, 0, PAGE_SIZE);
  45         return (pte_t *) (page);
  46 }
  47
  48 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  49                                          unsigned long address)
  50 {
  51         struct page *page = alloc_pages(GFP_KERNEL|__GFP_REPEAT, 0);
  52
  53         if (page == NULL)
  54                 return NULL;
  55
  56         clear_highpage(page);
  57         return page;
  58
  59 }
  60
  61 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
  62 {
  63         pmd_val(*pmd) = __pa((unsigned long)pte);
  64 }
  65
  66 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, struct page *page)
  67 {
  68         pmd_val(*pmd) = __pa((unsigned long)page_address(page));
  69 }
  70
  71 /*
  72  * allocating and freeing a pmd is trivial: the 1-entry pmd is
  73  * inside the pgd, so has no extra memory associated with it.
  74  */
  75 #define pmd_free(x)                     do { } while (0)
  76 #define __pmd_free_tlb(tlb, x)          do { } while (0)
  77
  78 static inline void pgd_free(pgd_t * pgd)
  79 {
  80         free_page((unsigned long) pgd);
  81 }
  82
  83 static inline pgd_t * pgd_alloc(struct mm_struct *mm)
  84 {
  85      pgd_t *new_pgd;
  86
  87      new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
  88      memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
  89      memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
  90      return new_pgd;
  91 }
  92
  93 #define pgd_populate(mm, pmd, pte) BUG()
  94
  95 #endif /* SUN3_PGALLOC_H */