1/*
2 * Based on arch/arm/include/asm/pgalloc.h
3 *
4 * Copyright (C) 2000-2001 Russell King
5 * Copyright (C) 2012 ARM Ltd.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
18 */
19#ifndef __ASM_PGALLOC_H
20#define __ASM_PGALLOC_H
21
22#include <asm/pgtable-hwdef.h>
23#include <asm/processor.h>
24#include <asm/cacheflush.h>
25#include <asm/tlbflush.h>
26
27#define check_pgt_cache()		do { } while (0)
28
29#define PGALLOC_GFP	(GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
30
31#if CONFIG_PGTABLE_LEVELS > 2
32
33static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
34{
35	return (pmd_t *)__get_free_page(PGALLOC_GFP);
36}
37
38static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
39{
40	BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
41	free_page((unsigned long)pmd);
42}
43
44static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
45{
46	set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
47}
48
49#endif	/* CONFIG_PGTABLE_LEVELS > 2 */
50
51#if CONFIG_PGTABLE_LEVELS > 3
52
53static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
54{
55	return (pud_t *)__get_free_page(PGALLOC_GFP);
56}
57
58static inline void pud_free(struct mm_struct *mm, pud_t *pud)
59{
60	BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
61	free_page((unsigned long)pud);
62}
63
64static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
65{
66	set_pgd(pgd, __pgd(__pa(pud) | PUD_TYPE_TABLE));
67}
68
69#endif	/* CONFIG_PGTABLE_LEVELS > 3 */
70
71extern pgd_t *pgd_alloc(struct mm_struct *mm);
72extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
73
74static inline pte_t *
75pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
76{
77	return (pte_t *)__get_free_page(PGALLOC_GFP);
78}
79
80static inline pgtable_t
81pte_alloc_one(struct mm_struct *mm, unsigned long addr)
82{
83	struct page *pte;
84
85	pte = alloc_pages(PGALLOC_GFP, 0);
86	if (!pte)
87		return NULL;
88	if (!pgtable_page_ctor(pte)) {
89		__free_page(pte);
90		return NULL;
91	}
92	return pte;
93}
94
95/*
96 * Free a PTE table.
97 */
98static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
99{
100	if (pte)
101		free_page((unsigned long)pte);
102}
103
104static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
105{
106	pgtable_page_dtor(pte);
107	__free_page(pte);
108}
109
110static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
111				  pmdval_t prot)
112{
113	set_pmd(pmdp, __pmd(pte | prot));
114}
115
116/*
117 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
118 * of the mm address space.
119 */
120static inline void
121pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
122{
123	/*
124	 * The pmd must be loaded with the physical address of the PTE table
125	 */
126	__pmd_populate(pmdp, __pa(ptep), PMD_TYPE_TABLE);
127}
128
129static inline void
130pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
131{
132	__pmd_populate(pmdp, page_to_phys(ptep), PMD_TYPE_TABLE);
133}
134#define pmd_pgtable(pmd) pmd_page(pmd)
135
136#endif
137