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
  24 pte_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, pmd, addr);
  39                 }
  40         }
  41
  42         return pte;
  43 }
  44
  45 pte_t *huge_pte_offset(struct mm_struct *mm,
  46                        unsigned long addr, unsigned long sz)
  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 pmd_huge(pmd_t pmd)
  67 {
  68         return 0;
  69 }
  70
  71 int pud_huge(pud_t pud)
  72 {
  73         return 0;
  74 }