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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 | ||
34 | #ifndef CONFIG_ARCH_WANT_HUGE_PMD_SHARE | |
35 | int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep) | |
36 | { | |
37 | return 0; | |
38 | } | |
39 | #endif | |
40 | ||
41 | struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address, | |
42 | int write) | |
43 | { | |
44 | return ERR_PTR(-EINVAL); | |
45 | } | |
46 | ||
47 | int pmd_huge(pmd_t pmd) | |
48 | { | |
49 | return !(pmd_val(pmd) & PMD_TABLE_BIT); | |
50 | } | |
51 | ||
52 | int pud_huge(pud_t pud) | |
53 | { | |
4797ec2d | 54 | #ifndef __PAGETABLE_PMD_FOLDED |
084bd298 | 55 | return !(pud_val(pud) & PUD_TABLE_BIT); |
4797ec2d MS |
56 | #else |
57 | return 0; | |
58 | #endif | |
084bd298 SC |
59 | } |
60 | ||
83467efb NH |
61 | int pmd_huge_support(void) |
62 | { | |
63 | return 1; | |
64 | } | |
65 | ||
084bd298 SC |
66 | static __init int setup_hugepagesz(char *opt) |
67 | { | |
68 | unsigned long ps = memparse(opt, &opt); | |
69 | if (ps == PMD_SIZE) { | |
70 | hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT); | |
71 | } else if (ps == PUD_SIZE) { | |
72 | hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); | |
73 | } else { | |
74 | pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20); | |
75 | return 0; | |
76 | } | |
77 | return 1; | |
78 | } | |
79 | __setup("hugepagesz=", setup_hugepagesz); |