55 строки
1.3 KiB
C
55 строки
1.3 KiB
C
/*
|
|
* PGD allocation/freeing
|
|
*
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
* Author: Catalin Marinas <catalin.marinas@arm.com>
|
|
*
|
|
* 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/gfp.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/page.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
#include "mm.h"
|
|
|
|
#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
|
|
|
|
pgd_t *pgd_alloc(struct mm_struct *mm)
|
|
{
|
|
pgd_t *new_pgd;
|
|
|
|
if (PGD_SIZE == PAGE_SIZE)
|
|
new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL);
|
|
else
|
|
new_pgd = kzalloc(PGD_SIZE, GFP_KERNEL);
|
|
|
|
if (!new_pgd)
|
|
return NULL;
|
|
|
|
return new_pgd;
|
|
}
|
|
|
|
void pgd_free(struct mm_struct *mm, pgd_t *pgd)
|
|
{
|
|
if (PGD_SIZE == PAGE_SIZE)
|
|
free_page((unsigned long)pgd);
|
|
else
|
|
kfree(pgd);
|
|
}
|