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_TABLE     _PAGE_PRESENT
23
24/*
25 * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to
26 * distinguish them from swapped out pages
27 */
28#define _PAGE_PROT_NONE _PAGE_GLOBAL
29
30/* Used for swap PTEs only. */
31#define _PAGE_SWP_EXCLUSIVE _PAGE_ACCESSED
32
33#define _PAGE_PFN_SHIFT 10
34
35/*
36 * when all of R/W/X are zero, the PTE is a pointer to the next level
37 * of the page table; otherwise, it is a leaf PTE.
38 */
39#define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
40
41#endif /* _ASM_RISCV_PGTABLE_BITS_H */
42