LXR linux/arch/m68k/include/asm/mcf

   1#ifndef M68K_MCF_PGALLOC_H
   2#define M68K_MCF_PGALLOC_H
   3
   4#include <asm/tlb.h>
   5#include <asm/tlbflush.h>
   6
   7extern inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
   8{
   9        free_page((unsigned long) pte);
  10}
  11
  12extern const char bad_pmd_string[];
  13
  14extern inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  15        unsigned long address)
  16{
  17        unsigned long page = __get_free_page(GFP_DMA|__GFP_REPEAT);
  18
  19        if (!page)
  20                return NULL;
  21
  22        memset((void *)page, 0, PAGE_SIZE);
  23        return (pte_t *) (page);
  24}
  25
  26extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
  27{
  28        return (pmd_t *) pgd;
  29}
  30
  31#define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); })
  32#define pmd_alloc_one(mm, address)      ({ BUG(); ((pmd_t *)2); })
  33
  34#define pte_alloc_one_fast(mm, addr) pte_alloc_one(mm, addr)
  35
  36#define pmd_populate(mm, pmd, page) (pmd_val(*pmd) = \
  37        (unsigned long)(page_address(page)))
  38
  39#define pmd_populate_kernel(mm, pmd, pte) (pmd_val(*pmd) = (unsigned long)(pte))
  40
  41#define pmd_pgtable(pmd) pmd_page(pmd)
  42
  43static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t page,
  44                                  unsigned long address)
  45{
  46        __free_page(page);
  47}
  48
  49#define __pmd_free_tlb(tlb, pmd, address) do { } while (0)
  50
  51static inline struct page *pte_alloc_one(struct mm_struct *mm,
  52        unsigned long address)
  53{
  54        struct page *page = alloc_pages(GFP_DMA|__GFP_REPEAT, 0);
  55        pte_t *pte;
  56
  57        if (!page)
  58                return NULL;
  59
  60        pte = kmap(page);
  61        if (pte) {
  62                clear_page(pte);
  63                __flush_page_to_ram(pte);
  64                flush_tlb_kernel_page(pte);
  65                nocache_page(pte);
  66        }
  67        kunmap(page);
  68
  69        return page;
  70}
  71
  72extern inline void pte_free(struct mm_struct *mm, struct page *page)
  73{
  74        __free_page(page);
  75}
  76
  77/*
  78 * In our implementation, each pgd entry contains 1 pmd that is never allocated
  79 * or freed.  pgd_present is always 1, so this should never be called. -NL
  80 */
  81#define pmd_free(mm, pmd) BUG()
  82
  83static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  84{
  85        free_page((unsigned long) pgd);
  86}
  87
  88static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  89{
  90        pgd_t *new_pgd;
  91
  92        new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
  93        if (!new_pgd)
  94                return NULL;
  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 /* M68K_MCF_PGALLOC_H */
 103