Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 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;

}