Linux kernel mirror (for testing)
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linux
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/tlb.h>
12
13#ifdef CONFIG_MMU
14#define __HAVE_ARCH_PUD_ALLOC_ONE
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_alloc_one pud_alloc_one
83static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
84{
85 if (pgtable_l4_enabled)
86 return __pud_alloc_one(mm, addr);
87
88 return NULL;
89}
90
91#define pud_free pud_free
92static inline void pud_free(struct mm_struct *mm, pud_t *pud)
93{
94 if (pgtable_l4_enabled)
95 __pud_free(mm, pud);
96}
97
98#define __pud_free_tlb(tlb, pud, addr) pud_free((tlb)->mm, pud)
99
100#define p4d_alloc_one p4d_alloc_one
101static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
102{
103 if (pgtable_l5_enabled) {
104 gfp_t gfp = GFP_PGTABLE_USER;
105
106 if (mm == &init_mm)
107 gfp = GFP_PGTABLE_KERNEL;
108 return (p4d_t *)get_zeroed_page(gfp);
109 }
110
111 return NULL;
112}
113
114static inline void __p4d_free(struct mm_struct *mm, p4d_t *p4d)
115{
116 BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
117 free_page((unsigned long)p4d);
118}
119
120#define p4d_free p4d_free
121static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
122{
123 if (pgtable_l5_enabled)
124 __p4d_free(mm, p4d);
125}
126
127#define __p4d_free_tlb(tlb, p4d, addr) p4d_free((tlb)->mm, p4d)
128#endif /* __PAGETABLE_PMD_FOLDED */
129
130static inline void sync_kernel_mappings(pgd_t *pgd)
131{
132 memcpy(pgd + USER_PTRS_PER_PGD,
133 init_mm.pgd + USER_PTRS_PER_PGD,
134 (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
135}
136
137static inline pgd_t *pgd_alloc(struct mm_struct *mm)
138{
139 pgd_t *pgd;
140
141 pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
142 if (likely(pgd != NULL)) {
143 memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
144 /* Copy kernel mappings */
145 sync_kernel_mappings(pgd);
146 }
147 return pgd;
148}
149
150#ifndef __PAGETABLE_PMD_FOLDED
151
152#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd)
153
154#endif /* __PAGETABLE_PMD_FOLDED */
155
156#define __pte_free_tlb(tlb, pte, buf) \
157do { \
158 pgtable_pte_page_dtor(pte); \
159 tlb_remove_page((tlb), pte); \
160} while (0)
161#endif /* CONFIG_MMU */
162
163#endif /* _ASM_RISCV_PGALLOC_H */