2 * arch/arm/mm/hugetlbpage.c
4 * Copyright (C) 2012 ARM Ltd.
6 * Based on arch/x86/include/asm/hugetlb.h and Bill Carson's patches
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.
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.
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
22 #include <linux/init.h>
25 #include <linux/hugetlb.h>
26 #include <linux/pagemap.h>
27 #include <linux/err.h>
28 #include <linux/sysctl.h>
31 #include <asm/tlbflush.h>
32 #include <asm/pgalloc.h>
35 * On ARM, huge pages are backed by pmd's rather than pte's, so we do a lot
36 * of type casting from pmd_t * to pte_t *.
39 pte_t
*huge_pte_offset(struct mm_struct
*mm
, unsigned long addr
)
45 pgd
= pgd_offset(mm
, addr
);
46 if (pgd_present(*pgd
)) {
47 pud
= pud_offset(pgd
, addr
);
48 if (pud_present(*pud
))
49 pmd
= pmd_offset(pud
, addr
);
55 struct page
*follow_huge_addr(struct mm_struct
*mm
, unsigned long address
,
58 return ERR_PTR(-EINVAL
);
61 int pud_huge(pud_t pud
)
66 int huge_pmd_unshare(struct mm_struct
*mm
, unsigned long *addr
, pte_t
*ptep
)
71 pte_t
*huge_pte_alloc(struct mm_struct
*mm
,
72 unsigned long addr
, unsigned long sz
)
78 pgd
= pgd_offset(mm
, addr
);
79 pud
= pud_alloc(mm
, pgd
, addr
);
81 pte
= (pte_t
*)pmd_alloc(mm
, pud
, addr
);
87 follow_huge_pmd(struct mm_struct
*mm
, unsigned long address
,
88 pmd_t
*pmd
, int write
)
92 page
= pte_page(*(pte_t
*)pmd
);
94 page
+= ((address
& ~PMD_MASK
) >> PAGE_SHIFT
);
98 int pmd_huge(pmd_t pmd
)
100 return pmd_val(pmd
) && !(pmd_val(pmd
) & PMD_TABLE_BIT
);
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