1/*
 2 * arch/arm/mm/hugetlbpage.c
 3 *
 4 * Copyright (C) 2012 ARM Ltd.
 5 *
 6 * Based on arch/x86/include/asm/hugetlb.h and Bill Carson's patches
 7 *
 8 * This program is free software; you can redistribute it and/or modify
 9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#include <linux/init.h>
23#include <linux/fs.h>
24#include <linux/mm.h>
25#include <linux/hugetlb.h>
26#include <linux/pagemap.h>
27#include <linux/err.h>
28#include <linux/sysctl.h>
29#include <asm/mman.h>
30#include <asm/tlb.h>
31#include <asm/tlbflush.h>
32#include <asm/pgalloc.h>
33
34/*
35 * On ARM, huge pages are backed by pmd's rather than pte's, so we do a lot
36 * of type casting from pmd_t * to pte_t *.
37 */
38
39int pud_huge(pud_t pud)
40{
41	return 0;
42}
43
44int pmd_huge(pmd_t pmd)
45{
46	return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
47}