Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2012 Regents of the University of California
4 */
5
6#ifndef _ASM_RISCV_PGTABLE_BITS_H
7#define _ASM_RISCV_PGTABLE_BITS_H
8
9#define _PAGE_ACCESSED_OFFSET 6
10
11#define _PAGE_PRESENT (1 << 0)
12#define _PAGE_READ (1 << 1) /* Readable */
13#define _PAGE_WRITE (1 << 2) /* Writable */
14#define _PAGE_EXEC (1 << 3) /* Executable */
15#define _PAGE_USER (1 << 4) /* User */
16#define _PAGE_GLOBAL (1 << 5) /* Global */
17#define _PAGE_ACCESSED (1 << 6) /* Set by hardware on any access */
18#define _PAGE_DIRTY (1 << 7) /* Set by hardware on any write */
19#define _PAGE_SOFT (3 << 8) /* Reserved for software */
20
21#define _PAGE_SPECIAL (1 << 8) /* RSW: 0x1 */
22#define _PAGE_DEVMAP (1 << 9) /* RSW, devmap */
23#define _PAGE_TABLE _PAGE_PRESENT
24
25/*
26 * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to
27 * distinguish them from swapped out pages
28 */
29#define _PAGE_PROT_NONE _PAGE_GLOBAL
30
31/* Used for swap PTEs only. */
32#define _PAGE_SWP_EXCLUSIVE _PAGE_ACCESSED
33
34#define _PAGE_PFN_SHIFT 10
35
36/*
37 * when all of R/W/X are zero, the PTE is a pointer to the next level
38 * of the page table; otherwise, it is a leaf PTE.
39 */
40#define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
41
42#endif /* _ASM_RISCV_PGTABLE_BITS_H */