Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Based on arch/arm/include/asm/pgalloc.h
4 *
5 * Copyright (C) 2000-2001 Russell King
6 * Copyright (C) 2012 ARM Ltd.
7 */
8#ifndef __ASM_PGALLOC_H
9#define __ASM_PGALLOC_H
10
11#include <asm/pgtable-hwdef.h>
12#include <asm/processor.h>
13#include <asm/cacheflush.h>
14#include <asm/tlbflush.h>
15
16#define __HAVE_ARCH_PGD_FREE
17#define __HAVE_ARCH_PUD_FREE
18#include <asm-generic/pgalloc.h>
19
20#define PGD_SIZE (PTRS_PER_PGD * sizeof(pgd_t))
21
22#if CONFIG_PGTABLE_LEVELS > 2
23
24static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
25{
26 set_pud(pudp, __pud(__phys_to_pud_val(pmdp) | prot));
27}
28
29static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
30{
31 pudval_t pudval = PUD_TYPE_TABLE | PUD_TABLE_AF;
32
33 pudval |= (mm == &init_mm) ? PUD_TABLE_UXN : PUD_TABLE_PXN;
34 __pud_populate(pudp, __pa(pmdp), pudval);
35}
36#else
37static inline void __pud_populate(pud_t *pudp, phys_addr_t pmdp, pudval_t prot)
38{
39 BUILD_BUG();
40}
41#endif /* CONFIG_PGTABLE_LEVELS > 2 */
42
43#if CONFIG_PGTABLE_LEVELS > 3
44
45static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
46{
47 if (pgtable_l4_enabled())
48 set_p4d(p4dp, __p4d(__phys_to_p4d_val(pudp) | prot));
49}
50
51static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp)
52{
53 p4dval_t p4dval = P4D_TYPE_TABLE | P4D_TABLE_AF;
54
55 p4dval |= (mm == &init_mm) ? P4D_TABLE_UXN : P4D_TABLE_PXN;
56 __p4d_populate(p4dp, __pa(pudp), p4dval);
57}
58
59static inline void pud_free(struct mm_struct *mm, pud_t *pud)
60{
61 if (!pgtable_l4_enabled())
62 return;
63 __pud_free(mm, pud);
64}
65#else
66static inline void __p4d_populate(p4d_t *p4dp, phys_addr_t pudp, p4dval_t prot)
67{
68 BUILD_BUG();
69}
70#endif /* CONFIG_PGTABLE_LEVELS > 3 */
71
72#if CONFIG_PGTABLE_LEVELS > 4
73
74static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t p4dp, pgdval_t prot)
75{
76 if (pgtable_l5_enabled())
77 set_pgd(pgdp, __pgd(__phys_to_pgd_val(p4dp) | prot));
78}
79
80static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgdp, p4d_t *p4dp)
81{
82 pgdval_t pgdval = PGD_TYPE_TABLE | PGD_TABLE_AF;
83
84 pgdval |= (mm == &init_mm) ? PGD_TABLE_UXN : PGD_TABLE_PXN;
85 __pgd_populate(pgdp, __pa(p4dp), pgdval);
86}
87
88#else
89static inline void __pgd_populate(pgd_t *pgdp, phys_addr_t p4dp, pgdval_t prot)
90{
91 BUILD_BUG();
92}
93#endif /* CONFIG_PGTABLE_LEVELS > 4 */
94
95extern pgd_t *pgd_alloc(struct mm_struct *mm);
96extern void pgd_free(struct mm_struct *mm, pgd_t *pgdp);
97
98static inline void __pmd_populate(pmd_t *pmdp, phys_addr_t ptep,
99 pmdval_t prot)
100{
101 set_pmd(pmdp, __pmd(__phys_to_pmd_val(ptep) | prot));
102}
103
104/*
105 * Populate the pmdp entry with a pointer to the pte. This pmd is part
106 * of the mm address space.
107 */
108static inline void
109pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
110{
111 VM_BUG_ON(mm && mm != &init_mm);
112 __pmd_populate(pmdp, __pa(ptep),
113 PMD_TYPE_TABLE | PMD_TABLE_AF | PMD_TABLE_UXN);
114}
115
116static inline void
117pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
118{
119 VM_BUG_ON(mm == &init_mm);
120 __pmd_populate(pmdp, page_to_phys(ptep),
121 PMD_TYPE_TABLE | PMD_TABLE_AF | PMD_TABLE_PXN);
122}
123
124#endif