LXR linux/arch/m68k/include/asm/sun3

   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
  15extern const char bad_pmd_string[];
  16
  17#define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
  18
  19
  20static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  21{
  22        free_page((unsigned long) pte);
  23}
  24
  25static 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)                    \
  32do {                                                    \
  33        pgtable_page_dtor(pte);                         \
  34        tlb_remove_page((tlb), pte);                    \
  35} while (0)
  36
  37static 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
  49static 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
  66static 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
  71static 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
  84static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  85{
  86        free_page((unsigned long) pgd);
  87}
  88
  89static 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 */
 102