Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
4 * Copyright (C) 2012 Regents of the University of California
5 */
6
7#ifndef _ASM_RISCV_PGALLOC_H
8#define _ASM_RISCV_PGALLOC_H
9
10#include <linux/mm.h>
11#include <asm/sbi.h>
12#include <asm/tlb.h>
13
14#ifdef CONFIG_MMU
15#define __HAVE_ARCH_PUD_FREE
16#include <asm-generic/pgalloc.h>
17
18static inline void pmd_populate_kernel(struct mm_struct *mm,
19 pmd_t *pmd, pte_t *pte)
20{
21 unsigned long pfn = virt_to_pfn(pte);
22
23 set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
24}
25
26static inline void pmd_populate(struct mm_struct *mm,
27 pmd_t *pmd, pgtable_t pte)
28{
29 unsigned long pfn = virt_to_pfn(page_address(pte));
30
31 set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
32}
33
34#ifndef __PAGETABLE_PMD_FOLDED
35static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
36{
37 unsigned long pfn = virt_to_pfn(pmd);
38
39 set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
40}
41
42static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
43{
44 if (pgtable_l4_enabled) {
45 unsigned long pfn = virt_to_pfn(pud);
46
47 set_p4d(p4d, __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
48 }
49}
50
51static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d,
52 pud_t *pud)
53{
54 if (pgtable_l4_enabled) {
55 unsigned long pfn = virt_to_pfn(pud);
56
57 set_p4d_safe(p4d,
58 __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
59 }
60}
61
62static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
63{
64 if (pgtable_l5_enabled) {
65 unsigned long pfn = virt_to_pfn(p4d);
66
67 set_pgd(pgd, __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
68 }
69}
70
71static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd,
72 p4d_t *p4d)
73{
74 if (pgtable_l5_enabled) {
75 unsigned long pfn = virt_to_pfn(p4d);
76
77 set_pgd_safe(pgd,
78 __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
79 }
80}
81
82#define pud_free pud_free
83static inline void pud_free(struct mm_struct *mm, pud_t *pud)
84{
85 if (pgtable_l4_enabled)
86 __pud_free(mm, pud);
87}
88
89static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
90 unsigned long addr)
91{
92 if (pgtable_l4_enabled)
93 tlb_remove_ptdesc(tlb, virt_to_ptdesc(pud));
94}
95
96static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
97 unsigned long addr)
98{
99 if (pgtable_l5_enabled)
100 tlb_remove_ptdesc(tlb, virt_to_ptdesc(p4d));
101}
102#endif /* __PAGETABLE_PMD_FOLDED */
103
104static inline void sync_kernel_mappings(pgd_t *pgd)
105{
106 memcpy(pgd + USER_PTRS_PER_PGD,
107 init_mm.pgd + USER_PTRS_PER_PGD,
108 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
109}
110
111static inline pgd_t *pgd_alloc(struct mm_struct *mm)
112{
113 pgd_t *pgd;
114
115 pgd = __pgd_alloc(mm, 0);
116 if (likely(pgd != NULL)) {
117 /* Copy kernel mappings */
118 sync_kernel_mappings(pgd);
119 }
120 return pgd;
121}
122
123#ifndef __PAGETABLE_PMD_FOLDED
124
125static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
126 unsigned long addr)
127{
128 tlb_remove_ptdesc(tlb, virt_to_ptdesc(pmd));
129}
130
131#endif /* __PAGETABLE_PMD_FOLDED */
132
133static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
134 unsigned long addr)
135{
136 tlb_remove_ptdesc(tlb, page_ptdesc(pte));
137}
138#endif /* CONFIG_MMU */
139
140#endif /* _ASM_RISCV_PGALLOC_H */