summaryrefslogtreecommitdiff
path: root/arch/riscv/include/asm/pgalloc.h
blob: d169a4f41a2e728276a97898e1270c7b4763f9ed (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
 * Copyright (C) 2012 Regents of the University of California
 */

#ifndef _ASM_RISCV_PGALLOC_H
#define _ASM_RISCV_PGALLOC_H

#include <linux/mm.h>
#include <asm/tlb.h>

#ifdef CONFIG_MMU
#define __HAVE_ARCH_PUD_ALLOC_ONE
#define __HAVE_ARCH_PUD_FREE
#include <asm-generic/pgalloc.h>

static inline void pmd_populate_kernel(struct mm_struct *mm,
	pmd_t *pmd, pte_t *pte)
{
	unsigned long pfn = virt_to_pfn(pte);

	set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}

static inline void pmd_populate(struct mm_struct *mm,
	pmd_t *pmd, pgtable_t pte)
{
	unsigned long pfn = virt_to_pfn(page_address(pte));

	set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}

#ifndef __PAGETABLE_PMD_FOLDED
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
	unsigned long pfn = virt_to_pfn(pmd);

	set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}

static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud)
{
	if (pgtable_l4_enabled) {
		unsigned long pfn = virt_to_pfn(pud);

		set_p4d(p4d, __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
	}
}

static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d,
				     pud_t *pud)
{
	if (pgtable_l4_enabled) {
		unsigned long pfn = virt_to_pfn(pud);

		set_p4d_safe(p4d,
			     __p4d((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
	}
}

static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d)
{
	if (pgtable_l5_enabled) {
		unsigned long pfn = virt_to_pfn(p4d);

		set_pgd(pgd, __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
	}
}

static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd,
				     p4d_t *p4d)
{
	if (pgtable_l5_enabled) {
		unsigned long pfn = virt_to_pfn(p4d);

		set_pgd_safe(pgd,
			     __pgd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
	}
}

#define pud_alloc_one pud_alloc_one
static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	if (pgtable_l4_enabled)
		return __pud_alloc_one(mm, addr);

	return NULL;
}

#define pud_free pud_free
static inline void pud_free(struct mm_struct *mm, pud_t *pud)
{
	if (pgtable_l4_enabled)
		__pud_free(mm, pud);
}

#define __pud_free_tlb(tlb, pud, addr)  pud_free((tlb)->mm, pud)

#define p4d_alloc_one p4d_alloc_one
static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	if (pgtable_l5_enabled) {
		gfp_t gfp = GFP_PGTABLE_USER;

		if (mm == &init_mm)
			gfp = GFP_PGTABLE_KERNEL;
		return (p4d_t *)get_zeroed_page(gfp);
	}

	return NULL;
}

static inline void __p4d_free(struct mm_struct *mm, p4d_t *p4d)
{
	BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
	free_page((unsigned long)p4d);
}

#define p4d_free p4d_free
static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
{
	if (pgtable_l5_enabled)
		__p4d_free(mm, p4d);
}

#define __p4d_free_tlb(tlb, p4d, addr)  p4d_free((tlb)->mm, p4d)
#endif /* __PAGETABLE_PMD_FOLDED */

static inline void sync_kernel_mappings(pgd_t *pgd)
{
	memcpy(pgd + USER_PTRS_PER_PGD,
	       init_mm.pgd + USER_PTRS_PER_PGD,
	       (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
}

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	pgd_t *pgd;

	pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
	if (likely(pgd != NULL)) {
		memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
		/* Copy kernel mappings */
		sync_kernel_mappings(pgd);
	}
	return pgd;
}

#ifndef __PAGETABLE_PMD_FOLDED

#define __pmd_free_tlb(tlb, pmd, addr)  pmd_free((tlb)->mm, pmd)

#endif /* __PAGETABLE_PMD_FOLDED */

#define __pte_free_tlb(tlb, pte, buf)			\
do {							\
	pagetable_pte_dtor(page_ptdesc(pte));		\
	tlb_remove_page_ptdesc((tlb), page_ptdesc(pte));\
} while (0)
#endif /* CONFIG_MMU */

#endif /* _ASM_RISCV_PGALLOC_H */