summaryrefslogtreecommitdiff
path: root/arch/riscv/include/asm/pgtable-64.h
blob: f3b0da64c6c8f2c1d6c87373b336a9737d3fcfe0 (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
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 Regents of the University of California
 */

#ifndef _ASM_RISCV_PGTABLE_64_H
#define _ASM_RISCV_PGTABLE_64_H

#include <linux/const.h>

#define PGDIR_SHIFT     30
/* Size of region mapped by a page global directory */
#define PGDIR_SIZE      (_AC(1, UL) << PGDIR_SHIFT)
#define PGDIR_MASK      (~(PGDIR_SIZE - 1))

#define PMD_SHIFT       21
/* Size of region mapped by a page middle directory */
#define PMD_SIZE        (_AC(1, UL) << PMD_SHIFT)
#define PMD_MASK        (~(PMD_SIZE - 1))

/* Page Middle Directory entry */
typedef struct {
	unsigned long pmd;
} pmd_t;

#define pmd_val(x)      ((x).pmd)
#define __pmd(x)        ((pmd_t) { (x) })

#define PTRS_PER_PMD    (PAGE_SIZE / sizeof(pmd_t))

static inline int pud_present(pud_t pud)
{
	return (pud_val(pud) & _PAGE_PRESENT);
}

static inline int pud_none(pud_t pud)
{
	return (pud_val(pud) == 0);
}

static inline int pud_bad(pud_t pud)
{
	return !pud_present(pud);
}

#define pud_leaf	pud_leaf
static inline int pud_leaf(pud_t pud)
{
	return pud_present(pud) &&
	       (pud_val(pud) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC));
}

static inline void set_pud(pud_t *pudp, pud_t pud)
{
	*pudp = pud;
}

static inline void pud_clear(pud_t *pudp)
{
	set_pud(pudp, __pud(0));
}

static inline unsigned long pud_page_vaddr(pud_t pud)
{
	return (unsigned long)pfn_to_virt(pud_val(pud) >> _PAGE_PFN_SHIFT);
}

static inline struct page *pud_page(pud_t pud)
{
	return pfn_to_page(pud_val(pud) >> _PAGE_PFN_SHIFT);
}

static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot)
{
	return __pmd((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
}

static inline unsigned long _pmd_pfn(pmd_t pmd)
{
	return pmd_val(pmd) >> _PAGE_PFN_SHIFT;
}

#define pmd_ERROR(e) \
	pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))

#endif /* _ASM_RISCV_PGTABLE_64_H */