blob: d7762349ea4869be1b40898a5ae7e6ff8e79c6aa [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * arch/sh/mm/hugetlbpage.c
3 *
4 * SuperH HugeTLB page support.
5 *
6 * Cloned from sparc64 by Paul Mundt.
7 *
8 * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
9 */
10
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/init.h>
12#include <linux/fs.h>
13#include <linux/mm.h>
14#include <linux/hugetlb.h>
15#include <linux/pagemap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/sysctl.h>
17
18#include <asm/mman.h>
19#include <asm/pgalloc.h>
20#include <asm/tlb.h>
21#include <asm/tlbflush.h>
22#include <asm/cacheflush.h>
23
Andi Kleena5516432008-07-23 21:27:41 -070024pte_t *huge_pte_alloc(struct mm_struct *mm,
25 unsigned long addr, unsigned long sz)
Linus Torvalds1da177e2005-04-16 15:20:36 -070026{
27 pgd_t *pgd;
Paul Mundt3f787fe2006-09-27 13:11:57 +090028 pud_t *pud;
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 pmd_t *pmd;
30 pte_t *pte = NULL;
31
32 pgd = pgd_offset(mm, addr);
33 if (pgd) {
Paul Mundt3f787fe2006-09-27 13:11:57 +090034 pud = pud_alloc(mm, pgd, addr);
35 if (pud) {
36 pmd = pmd_alloc(mm, pud, addr);
37 if (pmd)
Andrea Arcangeli8ac1f832011-01-13 15:46:43 -080038 pte = pte_alloc_map(mm, NULL, pmd, addr);
Paul Mundt3f787fe2006-09-27 13:11:57 +090039 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 }
Paul Mundt3f787fe2006-09-27 13:11:57 +090041
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 return pte;
43}
44
David Gibson63551ae2005-06-21 17:14:44 -070045pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046{
47 pgd_t *pgd;
Paul Mundt3f787fe2006-09-27 13:11:57 +090048 pud_t *pud;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 pmd_t *pmd;
50 pte_t *pte = NULL;
51
52 pgd = pgd_offset(mm, addr);
53 if (pgd) {
Paul Mundt3f787fe2006-09-27 13:11:57 +090054 pud = pud_offset(pgd, addr);
55 if (pud) {
56 pmd = pmd_offset(pud, addr);
57 if (pmd)
58 pte = pte_offset_map(pmd, addr);
59 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 }
Paul Mundt3f787fe2006-09-27 13:11:57 +090061
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 return pte;
63}
64
Chen, Kenneth W39dde652006-12-06 20:32:03 -080065int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
66{
67 return 0;
68}
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070struct page *follow_huge_addr(struct mm_struct *mm,
71 unsigned long address, int write)
72{
73 return ERR_PTR(-EINVAL);
74}
75
76int pmd_huge(pmd_t pmd)
77{
78 return 0;
79}
80
Andi Kleenceb86872008-07-23 21:27:50 -070081int pud_huge(pud_t pud)
82{
83 return 0;
84}
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
87 pmd_t *pmd, int write)
88{
89 return NULL;
90}