1/*
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
11#include <linux/init.h>
12#include <linux/fs.h>
13#include <linux/mm.h>
14#include <linux/hugetlb.h>
15#include <linux/pagemap.h>
16#include <linux/slab.h>
17#include <linux/sysctl.h>
18
19#include <asm/mman.h>
20#include <asm/pgalloc.h>
21#include <asm/tlb.h>
22#include <asm/tlbflush.h>
23#include <asm/cacheflush.h>
24
25pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr)
26{
27	pgd_t *pgd;
28	pud_t *pud;
29	pmd_t *pmd;
30	pte_t *pte = NULL;
31
32	pgd = pgd_offset(mm, addr);
33	if (pgd) {
34		pud = pud_alloc(mm, pgd, addr);
35		if (pud) {
36			pmd = pmd_alloc(mm, pud, addr);
37			if (pmd)
38				pte = pte_alloc_map(mm, pmd, addr);
39		}
40	}
41
42	return pte;
43}
44
45pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
46{
47	pgd_t *pgd;
48	pud_t *pud;
49	pmd_t *pmd;
50	pte_t *pte = NULL;
51
52	pgd = pgd_offset(mm, addr);
53	if (pgd) {
54		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		}
60	}
61
62	return pte;
63}
64
65int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
66{
67	return 0;
68}
69
70struct 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
81struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
82			     pmd_t *pmd, int write)
83{
84	return NULL;
85}
86