1 /*
2  * arch/arm/include/asm/hugetlb-3level.h
3  *
4  * Copyright (C) 2012 ARM Ltd.
5  *
6  * Based on arch/x86/include/asm/hugetlb.h.
7  *
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.
11  *
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.
16  *
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
20  */
21 
22 #ifndef _ASM_ARM_HUGETLB_3LEVEL_H
23 #define _ASM_ARM_HUGETLB_3LEVEL_H
24 
25 
26 /*
27  * If our huge pte is non-zero then mark the valid bit.
28  * This allows pte_present(huge_ptep_get(ptep)) to return true for non-zero
29  * ptes.
30  * (The valid bit is automatically cleared by set_pte_at for PROT_NONE ptes).
31  */
32 static inline pte_t huge_ptep_get(pte_t *ptep)
33 {
34 	pte_t retval = *ptep;
35 	if (pte_val(retval))
36 		pte_val(retval) |= L_PTE_VALID;
37 	return retval;
38 }
39 
40 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
41 				   pte_t *ptep, pte_t pte)
42 {
43 	set_pte_at(mm, addr, ptep, pte);
44 }
45 
46 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
47 					 unsigned long addr, pte_t *ptep)
48 {
49 	ptep_clear_flush(vma, addr, ptep);
50 }
51 
52 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
53 					   unsigned long addr, pte_t *ptep)
54 {
55 	ptep_set_wrprotect(mm, addr, ptep);
56 }
57 
58 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
59 					    unsigned long addr, pte_t *ptep)
60 {
61 	return ptep_get_and_clear(mm, addr, ptep);
62 }
63 
64 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
65 					     unsigned long addr, pte_t *ptep,
66 					     pte_t pte, int dirty)
67 {
68 	return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
69 }
70 
71 #endif /* _ASM_ARM_HUGETLB_3LEVEL_H */
72