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[deliverable/linux.git] / arch / arm64 / mm / hugetlbpage.c
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1/*
2 * arch/arm64/mm/hugetlbpage.c
3 *
4 * Copyright (C) 2013 Linaro Ltd.
5 *
6 * Based on arch/x86/mm/hugetlbpage.c.
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#ifndef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
35int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
36{
37 return 0;
38}
39#endif
40
41struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
42 int write)
43{
44 return ERR_PTR(-EINVAL);
45}
46
47int pmd_huge(pmd_t pmd)
48{
49 return !(pmd_val(pmd) & PMD_TABLE_BIT);
50}
51
52int pud_huge(pud_t pud)
53{
4797ec2d 54#ifndef __PAGETABLE_PMD_FOLDED
084bd298 55 return !(pud_val(pud) & PUD_TABLE_BIT);
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56#else
57 return 0;
58#endif
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59}
60
83467efb
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61int pmd_huge_support(void)
62{
63 return 1;
64}
65
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66static __init int setup_hugepagesz(char *opt)
67{
68 unsigned long ps = memparse(opt, &opt);
69 if (ps == PMD_SIZE) {
70 hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
71 } else if (ps == PUD_SIZE) {
72 hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
73 } else {
74 pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20);
75 return 0;
76 }
77 return 1;
78}
79__setup("hugepagesz=", setup_hugepagesz);
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