linux/arch/m68k/include/asm/sun3_pgalloc.h
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   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
  19extern const char bad_pmd_string[];
  20
  21#define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
  22
  23
  24static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  25{
  26        free_page((unsigned long) pte);
  27}
  28
  29static 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)                    \
  36do {                                                    \
  37        pgtable_page_dtor(pte);                         \
  38        tlb_remove_page((tlb), pte);                    \
  39} while (0)
  40
  41static 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
  53static 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
  67static 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
  72static 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
  85static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  86{
  87        free_page((unsigned long) pgd);
  88}
  89
  90static 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 */
 103
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