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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * arch/arm/include/asm/pgalloc.h
4 *
5 * Copyright (C) 2000-2001 Russell King
6 */
7#ifndef _ASMARM_PGALLOC_H
8#define _ASMARM_PGALLOC_H
9
10#include <linux/pagemap.h>
11
12#include <asm/domain.h>
13#include <asm/pgtable-hwdef.h>
14#include <asm/processor.h>
15#include <asm/cacheflush.h>
16#include <asm/tlbflush.h>
17
18#ifdef CONFIG_MMU
19
20#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
21#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
22
23#ifdef CONFIG_ARM_LPAE
24
25static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
26{
27 set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
28}
29
30#else /* !CONFIG_ARM_LPAE */
31
32/*
33 * Since we have only two-level page tables, these are trivial
34 */
35#define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); })
36#define pmd_free(mm, pmd) do { } while (0)
37#define pud_populate(mm,pmd,pte) BUG()
38
39#endif /* CONFIG_ARM_LPAE */
40
41extern pgd_t *pgd_alloc(struct mm_struct *mm);
42extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
43
44static inline void clean_pte_table(pte_t *pte)
45{
46 clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);
47}
48
49/*
50 * Allocate one PTE table.
51 *
52 * This actually allocates two hardware PTE tables, but we wrap this up
53 * into one table thus:
54 *
55 * +------------+
56 * | Linux pt 0 |
57 * +------------+
58 * | Linux pt 1 |
59 * +------------+
60 * | h/w pt 0 |
61 * +------------+
62 * | h/w pt 1 |
63 * +------------+
64 */
65
66#define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
67#define __HAVE_ARCH_PTE_ALLOC_ONE
68#define __HAVE_ARCH_PGD_FREE
69#include <asm-generic/pgalloc.h>
70
71static inline pte_t *
72pte_alloc_one_kernel(struct mm_struct *mm)
73{
74 pte_t *pte = __pte_alloc_one_kernel(mm);
75
76 if (pte)
77 clean_pte_table(pte);
78
79 return pte;
80}
81
82#ifdef CONFIG_HIGHPTE
83#define PGTABLE_HIGHMEM __GFP_HIGHMEM
84#else
85#define PGTABLE_HIGHMEM 0
86#endif
87
88static inline pgtable_t
89pte_alloc_one(struct mm_struct *mm)
90{
91 struct page *pte;
92
93 pte = __pte_alloc_one(mm, GFP_PGTABLE_USER | PGTABLE_HIGHMEM);
94 if (!pte)
95 return NULL;
96 if (!PageHighMem(pte))
97 clean_pte_table(page_address(pte));
98 return pte;
99}
100
101static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
102 pmdval_t prot)
103{
104 pmdval_t pmdval = (pte + PTE_HWTABLE_OFF) | prot;
105 pmdp[0] = __pmd(pmdval);
106#ifndef CONFIG_ARM_LPAE
107 pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
108#endif
109 flush_pmd_entry(pmdp);
110}
111
112/*
113 * Populate the pmdp entry with a pointer to the pte. This pmd is part
114 * of the mm address space.
115 *
116 * Ensure that we always set both PMD entries.
117 */
118static inline void
119pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
120{
121 /*
122 * The pmd must be loaded with the physical address of the PTE table
123 */
124 __pmd_populate(pmdp, __pa(ptep), _PAGE_KERNEL_TABLE);
125}
126
127static inline void
128pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
129{
130 extern pmdval_t user_pmd_table;
131 pmdval_t prot;
132
133 if (__LINUX_ARM_ARCH__ >= 6 && !IS_ENABLED(CONFIG_ARM_LPAE))
134 prot = user_pmd_table;
135 else
136 prot = _PAGE_USER_TABLE;
137
138 __pmd_populate(pmdp, page_to_phys(ptep), prot);
139}
140#define pmd_pgtable(pmd) pmd_page(pmd)
141
142#endif /* CONFIG_MMU */
143
144#endif
1/*
2 * arch/arm/include/asm/pgalloc.h
3 *
4 * Copyright (C) 2000-2001 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#ifndef _ASMARM_PGALLOC_H
11#define _ASMARM_PGALLOC_H
12
13#include <linux/pagemap.h>
14
15#include <asm/domain.h>
16#include <asm/pgtable-hwdef.h>
17#include <asm/processor.h>
18#include <asm/cacheflush.h>
19#include <asm/tlbflush.h>
20
21#define check_pgt_cache() do { } while (0)
22
23#ifdef CONFIG_MMU
24
25#define _PAGE_USER_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_USER))
26#define _PAGE_KERNEL_TABLE (PMD_TYPE_TABLE | PMD_BIT4 | PMD_DOMAIN(DOMAIN_KERNEL))
27
28#ifdef CONFIG_ARM_LPAE
29
30static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
31{
32 return (pmd_t *)get_zeroed_page(GFP_KERNEL | __GFP_REPEAT);
33}
34
35static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
36{
37 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
38 free_page((unsigned long)pmd);
39}
40
41static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
42{
43 set_pud(pud, __pud(__pa(pmd) | PMD_TYPE_TABLE));
44}
45
46#else /* !CONFIG_ARM_LPAE */
47
48/*
49 * Since we have only two-level page tables, these are trivial
50 */
51#define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); })
52#define pmd_free(mm, pmd) do { } while (0)
53#define pud_populate(mm,pmd,pte) BUG()
54
55#endif /* CONFIG_ARM_LPAE */
56
57extern pgd_t *pgd_alloc(struct mm_struct *mm);
58extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
59
60#define PGALLOC_GFP (GFP_KERNEL | __GFP_NOTRACK | __GFP_REPEAT | __GFP_ZERO)
61
62static inline void clean_pte_table(pte_t *pte)
63{
64 clean_dcache_area(pte + PTE_HWTABLE_PTRS, PTE_HWTABLE_SIZE);
65}
66
67/*
68 * Allocate one PTE table.
69 *
70 * This actually allocates two hardware PTE tables, but we wrap this up
71 * into one table thus:
72 *
73 * +------------+
74 * | Linux pt 0 |
75 * +------------+
76 * | Linux pt 1 |
77 * +------------+
78 * | h/w pt 0 |
79 * +------------+
80 * | h/w pt 1 |
81 * +------------+
82 */
83static inline pte_t *
84pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
85{
86 pte_t *pte;
87
88 pte = (pte_t *)__get_free_page(PGALLOC_GFP);
89 if (pte)
90 clean_pte_table(pte);
91
92 return pte;
93}
94
95static inline pgtable_t
96pte_alloc_one(struct mm_struct *mm, unsigned long addr)
97{
98 struct page *pte;
99
100#ifdef CONFIG_HIGHPTE
101 pte = alloc_pages(PGALLOC_GFP | __GFP_HIGHMEM, 0);
102#else
103 pte = alloc_pages(PGALLOC_GFP, 0);
104#endif
105 if (!pte)
106 return NULL;
107 if (!PageHighMem(pte))
108 clean_pte_table(page_address(pte));
109 if (!pgtable_page_ctor(pte)) {
110 __free_page(pte);
111 return NULL;
112 }
113 return pte;
114}
115
116/*
117 * Free one PTE table.
118 */
119static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
120{
121 if (pte)
122 free_page((unsigned long)pte);
123}
124
125static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
126{
127 pgtable_page_dtor(pte);
128 __free_page(pte);
129}
130
131static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t pte,
132 pmdval_t prot)
133{
134 pmdval_t pmdval = (pte + PTE_HWTABLE_OFF) | prot;
135 pmdp[0] = __pmd(pmdval);
136#ifndef CONFIG_ARM_LPAE
137 pmdp[1] = __pmd(pmdval + 256 * sizeof(pte_t));
138#endif
139 flush_pmd_entry(pmdp);
140}
141
142/*
143 * Populate the pmdp entry with a pointer to the pte. This pmd is part
144 * of the mm address space.
145 *
146 * Ensure that we always set both PMD entries.
147 */
148static inline void
149pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
150{
151 /*
152 * The pmd must be loaded with the physical address of the PTE table
153 */
154 __pmd_populate(pmdp, __pa(ptep), _PAGE_KERNEL_TABLE);
155}
156
157static inline void
158pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
159{
160 extern pmdval_t user_pmd_table;
161 pmdval_t prot;
162
163 if (__LINUX_ARM_ARCH__ >= 6 && !IS_ENABLED(CONFIG_ARM_LPAE))
164 prot = user_pmd_table;
165 else
166 prot = _PAGE_USER_TABLE;
167
168 __pmd_populate(pmdp, page_to_phys(ptep), prot);
169}
170#define pmd_pgtable(pmd) pmd_page(pmd)
171
172#endif /* CONFIG_MMU */
173
174#endif