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1355e2a6eb
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>
71 lines
2 KiB
C
71 lines
2 KiB
C
/*
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* arch/arm/include/asm/hugetlb-3level.h
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*
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* Copyright (C) 2012 ARM Ltd.
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*
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* Based on arch/x86/include/asm/hugetlb.h.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _ASM_ARM_HUGETLB_3LEVEL_H
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#define _ASM_ARM_HUGETLB_3LEVEL_H
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/*
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* If our huge pte is non-zero then mark the valid bit.
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* This allows pte_present(huge_ptep_get(ptep)) to return true for non-zero
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* ptes.
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* (The valid bit is automatically cleared by set_pte_at for PROT_NONE ptes).
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*/
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static inline pte_t huge_ptep_get(pte_t *ptep)
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{
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pte_t retval = *ptep;
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if (pte_val(retval))
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pte_val(retval) |= L_PTE_VALID;
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return retval;
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}
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static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte)
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{
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set_pte_at(mm, addr, ptep, pte);
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}
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static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep)
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{
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ptep_clear_flush(vma, addr, ptep);
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}
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static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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ptep_set_wrprotect(mm, addr, ptep);
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}
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static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
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unsigned long addr, pte_t *ptep)
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{
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return ptep_get_and_clear(mm, addr, ptep);
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}
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static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep,
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pte_t pte, int dirty)
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{
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return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
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}
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#endif /* _ASM_ARM_HUGETLB_3LEVEL_H */
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