Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Copyright (C) 2012 Regents of the University of California
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14#ifndef _ASM_RISCV_PGTABLE_BITS_H
15#define _ASM_RISCV_PGTABLE_BITS_H
16
17/*
18 * PTE format:
19 * | XLEN-1 10 | 9 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
20 * PFN reserved for SW D A G U X W R V
21 */
22
23#define _PAGE_ACCESSED_OFFSET 6
24
25#define _PAGE_PRESENT (1 << 0)
26#define _PAGE_READ (1 << 1) /* Readable */
27#define _PAGE_WRITE (1 << 2) /* Writable */
28#define _PAGE_EXEC (1 << 3) /* Executable */
29#define _PAGE_USER (1 << 4) /* User */
30#define _PAGE_GLOBAL (1 << 5) /* Global */
31#define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */
32#define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */
33#define _PAGE_SOFT (1 << 8) /* Reserved for software */
34
35#define _PAGE_SPECIAL _PAGE_SOFT
36#define _PAGE_TABLE _PAGE_PRESENT
37
38/*
39 * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to
40 * distinguish them from swapped out pages
41 */
42#define _PAGE_PROT_NONE _PAGE_READ
43
44#define _PAGE_PFN_SHIFT 10
45
46/* Set of bits to preserve across pte_modify() */
47#define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \
48 _PAGE_WRITE | _PAGE_EXEC | \
49 _PAGE_USER | _PAGE_GLOBAL))
50
51#endif /* _ASM_RISCV_PGTABLE_BITS_H */