LXR linux/arch/sh/mm/hugetlbpage.c

   1/*
   2 * arch/sh/mm/hugetlbpage.c
   3 *
   4 * SuperH HugeTLB page support.
   5 *
   6 * Cloned from sparc64 by Paul Mundt.
   7 *
   8 * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
   9 */
  10
  11#include <linux/init.h>
  12#include <linux/fs.h>
  13#include <linux/mm.h>
  14#include <linux/hugetlb.h>
  15#include <linux/pagemap.h>
  16#include <linux/sysctl.h>
  17
  18#include <asm/mman.h>
  19#include <asm/pgalloc.h>
  20#include <asm/tlb.h>
  21#include <asm/tlbflush.h>
  22#include <asm/cacheflush.h>
  23
  24pte_t *huge_pte_alloc(struct mm_struct *mm,
  25                        unsigned long addr, unsigned long sz)
  26{
  27        pgd_t *pgd;
  28        pud_t *pud;
  29        pmd_t *pmd;
  30        pte_t *pte = NULL;
  31
  32        pgd = pgd_offset(mm, addr);
  33        if (pgd) {
  34                pud = pud_alloc(mm, pgd, addr);
  35                if (pud) {
  36                        pmd = pmd_alloc(mm, pud, addr);
  37                        if (pmd)
  38                                pte = pte_alloc_map(mm, NULL, pmd, addr);
  39                }
  40        }
  41
  42        return pte;
  43}
  44
  45pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
  46{
  47        pgd_t *pgd;
  48        pud_t *pud;
  49        pmd_t *pmd;
  50        pte_t *pte = NULL;
  51
  52        pgd = pgd_offset(mm, addr);
  53        if (pgd) {
  54                pud = pud_offset(pgd, addr);
  55                if (pud) {
  56                        pmd = pmd_offset(pud, addr);
  57                        if (pmd)
  58                                pte = pte_offset_map(pmd, addr);
  59                }
  60        }
  61
  62        return pte;
  63}
  64
  65int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
  66{
  67        return 0;
  68}
  69
  70struct page *follow_huge_addr(struct mm_struct *mm,
  71                              unsigned long address, int write)
  72{
  73        return ERR_PTR(-EINVAL);
  74}
  75
  76int pmd_huge(pmd_t pmd)
  77{
  78        return 0;
  79}
  80
  81int pud_huge(pud_t pud)
  82{
  83        return 0;
  84}
  85
  86struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  87                             pmd_t *pmd, int write)
  88{
  89        return NULL;
  90}
  91