[mirror_ubuntu-zesty-kernel.git] / arch / arm64 / mm / hugetlbpage.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>

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);
Commit	Line	Data
084bd298 SC	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
084bd298 SC	34	int pmd_huge(pmd_t pmd)
	35	{
	36	return !(pmd_val(pmd) & PMD_TABLE_BIT);
	37	}
	38
	39	int pud_huge(pud_t pud)
	40	{
4797ec2d	41	#ifndef __PAGETABLE_PMD_FOLDED
084bd298	42	return !(pud_val(pud) & PUD_TABLE_BIT);
4797ec2d MS	43	#else
	44	return 0;
	45	#endif
084bd298 SC	46	}
	47
	48	static __init int setup_hugepagesz(char *opt)
	49	{
	50	unsigned long ps = memparse(opt, &opt);
	51	if (ps == PMD_SIZE) {
	52	hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
	53	} else if (ps == PUD_SIZE) {
	54	hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
	55	} else {
	56	pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20);
	57	return 0;
	58	}
	59	return 1;
	60	}
	61	__setup("hugepagesz=", setup_hugepagesz);