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ARM: mm: HugeTLB support for LPAE systems.

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This patch adds support for hugetlbfs based on the x86 implementation.
It allows mapping of 2MB sections (see Documentation/vm/hugetlbpage.txt
for usage). The 64K pages configuration is not supported (section size
is 512MB in this case).

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
[steve.capper@linaro.org: symbolic constants replace numbers in places.
Split up into multiple files, to simplify future non-LPAE support,
removed huge_pmd_share code, as this is very rarely executed,
Added PROT_NONE support].
Signed-off-by: Steve Capper <steve.capper@linaro.org>
Reviewed-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Catalin Marinas
2012-07-25 14:32:38 +01:00
committed by Steve Capper
parent 0b19f93351
commit 1355e2a6eb
9 changed files with 276 additions and 2 deletions
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71
arch/arm/include/asm/hugetlb-3level.h Normal file
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/*
* arch/arm/include/asm/hugetlb-3level.h
*
* Copyright (C) 2012 ARM Ltd.
*
* Based on arch/x86/include/asm/hugetlb.h.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _ASM_ARM_HUGETLB_3LEVEL_H
#define _ASM_ARM_HUGETLB_3LEVEL_H
/*
* If our huge pte is non-zero then mark the valid bit.
* This allows pte_present(huge_ptep_get(ptep)) to return true for non-zero
* ptes.
* (The valid bit is automatically cleared by set_pte_at for PROT_NONE ptes).
*/
static inline pte_t huge_ptep_get(pte_t *ptep)
{
pte_t retval = *ptep;
if (pte_val(retval))
pte_val(retval) |= L_PTE_VALID;
return retval;
}
static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
set_pte_at(mm, addr, ptep, pte);
}
static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep)
{
ptep_clear_flush(vma, addr, ptep);
}
static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
ptep_set_wrprotect(mm, addr, ptep);
}
static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
return ptep_get_and_clear(mm, addr, ptep);
}
static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
unsigned long addr, pte_t *ptep,
pte_t pte, int dirty)
{
return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
}
#endif /* _ASM_ARM_HUGETLB_3LEVEL_H */