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        if (!pgtable_page_ctor(page)) {
  60                __free_page(page);
  61                return NULL;
  62        }
  63
  64        pte = kmap(page);
  65        if (pte) {
  66                clear_page(pte);
  67                __flush_page_to_ram(pte);
  68                flush_tlb_kernel_page(pte);
  69                nocache_page(pte);
  70        }
  71        kunmap(page);
  72
  73        return page;
  74}
  75
  76extern inline void pte_free(struct mm_struct *mm, struct page *page)
  77{
  78        __free_page(page);
  79}
  80
  81/*
  82 * In our implementation, each pgd entry contains 1 pmd that is never allocated
  83 * or freed.  pgd_present is always 1, so this should never be called. -NL
  84 */
  85#define pmd_free(mm, pmd) BUG()
  86
  87static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  88{
  89        free_page((unsigned long) pgd);
  90}
  91
  92static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  93{
  94        pgd_t *new_pgd;
  95
  96        new_pgd = (pgd_t *)__get_free_page(GFP_DMA | __GFP_NOWARN);
  97        if (!new_pgd)
  98                return NULL;
  99        memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
 100        memset(new_pgd, 0, PAGE_OFFSET >> PGDIR_SHIFT);
 101        return new_pgd;
 102}
 103
 104#define pgd_populate(mm, pmd, pte) BUG()
 105
 106#endif /* M68K_MCF_PGALLOC_H */
 107