75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/*
|
|
* arch/arm64/mm/hugetlbpage.c
|
|
*
|
|
* Copyright (C) 2013 Linaro Ltd.
|
|
*
|
|
* Based on arch/x86/mm/hugetlbpage.c.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/hugetlb.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/err.h>
|
|
#include <linux/sysctl.h>
|
|
#include <asm/mman.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/pgalloc.h>
|
|
|
|
#ifndef CONFIG_ARCH_WANT_HUGE_PMD_SHARE
|
|
int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
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 !(pmd_val(pmd) & PMD_TABLE_BIT);
|
|
}
|
|
|
|
int pud_huge(pud_t pud)
|
|
{
|
|
#ifndef __PAGETABLE_PMD_FOLDED
|
|
return !(pud_val(pud) & PUD_TABLE_BIT);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
static __init int setup_hugepagesz(char *opt)
|
|
{
|
|
unsigned long ps = memparse(opt, &opt);
|
|
if (ps == PMD_SIZE) {
|
|
hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
|
|
} else if (ps == PUD_SIZE) {
|
|
hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
|
|
} else {
|
|
pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
__setup("hugepagesz=", setup_hugepagesz);
|