linux/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{
  54        return !(pud_val(pud) & PUD_TABLE_BIT);
  55}
  56
  57static __init int setup_hugepagesz(char *opt)
  58{
  59        unsigned long ps = memparse(opt, &opt);
  60        if (ps == PMD_SIZE) {
  61                hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
  62        } else if (ps == PUD_SIZE) {
  63                hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
  64        } else {
  65                pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20);
  66                return 0;
  67        }
  68        return 1;
  69}
  70__setup("hugepagesz=", setup_hugepagesz);
  71