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hugetlbpage.c

/*
 * arch/sh64/mm/hugetlbpage.c
 *
 * SuperH HugeTLB page support.
 *
 * Cloned from sparc64 by Paul Mundt.
 *
 * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
 */

#include <linux/init.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/sysctl.h>

#include <asm/mman.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>

pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
{
      pgd_t *pgd;
      pmd_t *pmd;
      pte_t *pte = NULL;

      pgd = pgd_offset(mm, addr);
      if (pgd) {
            pmd = pmd_alloc(mm, pgd, addr);
            if (pmd)
                  pte = pte_alloc_map(mm, pmd, addr);
      }
      return pte;
}

pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
{
      pgd_t *pgd;
      pmd_t *pmd;
      pte_t *pte = NULL;

      pgd = pgd_offset(mm, addr);
      if (pgd) {
            pmd = pmd_offset(pgd, addr);
            if (pmd)
                  pte = pte_offset_map(pmd, addr);
      }
      return pte;
}

int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
{
      return 0;
}

void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
                 pte_t *ptep, pte_t entry)
{
      int i;

      for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
            set_pte_at(mm, addr, ptep, entry);
            ptep++;
            addr += PAGE_SIZE;
            pte_val(entry) += PAGE_SIZE;
      }
}

pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
                        pte_t *ptep)
{
      pte_t entry;
      int i;

      entry = *ptep;

      for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
            pte_clear(mm, addr, ptep);
            addr += PAGE_SIZE;
            ptep++;
      }

      return entry;
}

struct page *follow_huge_addr(struct mm_struct *mm,
                        unsigned long address, int write)
{
      return ERR_PTR(-EINVAL);
}

int pmd_huge(pmd_t pmd)
{
      return 0;
}

struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
                       pmd_t *pmd, int write)
{
      return NULL;
}

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