summaryrefslogtreecommitdiff
path: root/arch/arm64/include/asm/pgalloc.h
blob: 52fa47c73bf042efc0c84796dcf1a21c10c534c1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*
 * Based on arch/arm/include/asm/pgalloc.h
 *
 * Copyright (C) 2000-2001 Russell King
 * Copyright (C) 2012 ARM Ltd.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_PGALLOC_H
#define __ASM_PGALLOC_H

#include <asm/pgtable-hwdef.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>

#define check_pgt_cache()		do { } while (0)

#define PGALLOC_GFP	(GFP_KERNEL | __GFP_ZERO)
#define PGD_SIZE	(PTRS_PER_PGD * sizeof(pgd_t))

#if CONFIG_PGTABLE_LEVELS > 2

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	return (pmd_t *)__get_free_page(PGALLOC_GFP);
}

static inline void pmd_free(struct mm_struct *mm, pmd_t *pmdp)
{
	BUG_ON((unsigned long)pmdp & (PAGE_SIZE-1));
	free_page((unsigned long)pmdp);
}

static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
{
	set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
}

static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
{
	__pud_populate(pudp, __pa(pmdp), PMD_TYPE_TABLE);
}
#else
static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
{
	BUILD_BUG();
}
#endif	/* CONFIG_PGTABLE_LEVELS > 2 */

#if CONFIG_PGTABLE_LEVELS > 3

static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	return (pud_t *)__get_free_page(PGALLOC_GFP);
}

static inline void pud_free(struct mm_struct *mm, pud_t *pudp)
{
	BUG_ON((unsigned long)pudp & (PAGE_SIZE-1));
	free_page((unsigned long)pudp);
}

static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
{
	set_pgd(pgdp, __pgd(__phys_to_pgd_val(pudp) | prot));
}

static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, pud_t *pudp)
{
	__pgd_populate(pgdp, __pa(pudp), PUD_TYPE_TABLE);
}
#else
static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t pudp, pgdval_t prot)
{
	BUILD_BUG();
}
#endif	/* CONFIG_PGTABLE_LEVELS > 3 */

extern pgd_t *pgd_alloc(struct mm_struct *mm);
extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);

static inline pte_t *
pte_alloc_one_kernel(struct mm_struct *mm)
{
	return (pte_t *)__get_free_page(PGALLOC_GFP);
}

static inline pgtable_t
pte_alloc_one(struct mm_struct *mm)
{
	struct page *pte;

	pte = alloc_pages(PGALLOC_GFP, 0);
	if (!pte)
		return NULL;
	if (!pgtable_page_ctor(pte)) {
		__free_page(pte);
		return NULL;
	}
	return pte;
}

/*
 * Free a PTE table.
 */
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *ptep)
{
	if (ptep)
		free_page((unsigned long)ptep);
}

static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
{
	pgtable_page_dtor(pte);
	__free_page(pte);
}

static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
				  pmdval_t prot)
{
	set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
}

/*
 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
 * of the mm address space.
 */
static inline void
pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
{
	/*
	 * The pmd must be loaded with the physical address of the PTE table
	 */
	__pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
}

static inline void
pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
{
	__pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
}
#define pmd_pgtable(pmd) pmd_page(pmd)

#endif