diff options
Diffstat (limited to 'arch/arm64/mm/pgd.c')
-rw-r--r-- | arch/arm64/mm/pgd.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm64/mm/pgd.c b/arch/arm64/mm/pgd.c new file mode 100644 index 00000000000..7083cdada65 --- /dev/null +++ b/arch/arm64/mm/pgd.c | |||
@@ -0,0 +1,54 @@ | |||
1 | /* | ||
2 | * PGD allocation/freeing | ||
3 | * | ||
4 | * Copyright (C) 2012 ARM Ltd. | ||
5 | * Author: Catalin Marinas <catalin.marinas@arm.com> | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License version 2 as | ||
9 | * published by the Free Software Foundation. | ||
10 | * | ||
11 | * This program is distributed in the hope that it will be useful, | ||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
14 | * GNU General Public License for more details. | ||
15 | * | ||
16 | * You should have received a copy of the GNU General Public License | ||
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
18 | */ | ||
19 | |||
20 | #include <linux/mm.h> | ||
21 | #include <linux/gfp.h> | ||
22 | #include <linux/highmem.h> | ||
23 | #include <linux/slab.h> | ||
24 | |||
25 | #include <asm/pgalloc.h> | ||
26 | #include <asm/page.h> | ||
27 | #include <asm/tlbflush.h> | ||
28 | |||
29 | #include "mm.h" | ||
30 | |||
31 | #define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t)) | ||
32 | |||
33 | pgd_t *pgd_alloc(struct mm_struct *mm) | ||
34 | { | ||
35 | pgd_t *new_pgd; | ||
36 | |||
37 | if (PGD_SIZE == PAGE_SIZE) | ||
38 | new_pgd = (pgd_t *)get_zeroed_page(GFP_KERNEL); | ||
39 | else | ||
40 | new_pgd = kzalloc(PGD_SIZE, GFP_KERNEL); | ||
41 | |||
42 | if (!new_pgd) | ||
43 | return NULL; | ||
44 | |||
45 | return new_pgd; | ||
46 | } | ||
47 | |||
48 | void pgd_free(struct mm_struct *mm, pgd_t *pgd) | ||
49 | { | ||
50 | if (PGD_SIZE == PAGE_SIZE) | ||
51 | free_page((unsigned long)pgd); | ||
52 | else | ||
53 | kfree(pgd); | ||
54 | } | ||