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/slab.h>
  17 #include <linux/sysctl.h>
  18
  19 #include <asm/mman.h>
  20 #include <asm/pgalloc.h>
  21 #include <asm/tlb.h>
  22 #include <asm/tlbflush.h>
  23 #include <asm/cacheflush.h>
  24
  25 pte_t *huge_pte_alloc(struct mm_struct *mm,
  26                         unsigned long addr, unsigned long sz)
  27 {
  28         pgd_t *pgd;
  29         pud_t *pud;
  30         pmd_t *pmd;
  31         pte_t *pte = NULL;
  32
  33         pgd = pgd_offset(mm, addr);
  34         if (pgd) {
  35                 pud = pud_alloc(mm, pgd, addr);
  36                 if (pud) {
  37                         pmd = pmd_alloc(mm, pud, addr);
  38                         if (pmd)
  39                                 pte = pte_alloc_map(mm, pmd, addr);
  40                 }
  41         }
  42
  43         return pte;
  44 }
  45
  46 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
  47 {
  48         pgd_t *pgd;
  49         pud_t *pud;
  50         pmd_t *pmd;
  51         pte_t *pte = NULL;
  52
  53         pgd = pgd_offset(mm, addr);
  54         if (pgd) {
  55                 pud = pud_offset(pgd, addr);
  56                 if (pud) {
  57                         pmd = pmd_offset(pud, addr);
  58                         if (pmd)
  59                                 pte = pte_offset_map(pmd, addr);
  60                 }
  61         }
  62
  63         return pte;
  64 }
  65
  66 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
  67 {
  68         return 0;
  69 }
  70
  71 struct page *follow_huge_addr(struct mm_struct *mm,
  72                               unsigned long address, int write)
  73 {
  74         return ERR_PTR(-EINVAL);
  75 }
  76
  77 int pmd_huge(pmd_t pmd)
  78 {
  79         return 0;
  80 }
  81
  82 int pud_huge(pud_t pud)
  83 {
  84         return 0;
  85 }
  86
  87 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  88                              pmd_t *pmd, int write)
  89 {
  90         return NULL;
  91 }