1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2012 Regents of the University of California
6 #ifndef _ASM_RISCV_PGTABLE_BITS_H
7 #define _ASM_RISCV_PGTABLE_BITS_H
9 #define _PAGE_ACCESSED_OFFSET 6
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 (1 << 8) /* Reserved for software */
21 #define _PAGE_SPECIAL _PAGE_SOFT
22 #define _PAGE_TABLE _PAGE_PRESENT
25 * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to
26 * distinguish them from swapped out pages
28 #define _PAGE_PROT_NONE _PAGE_GLOBAL
30 /* Used for swap PTEs only. */
31 #define _PAGE_SWP_EXCLUSIVE _PAGE_ACCESSED
33 #define _PAGE_PFN_SHIFT 10
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.
39 #define _PAGE_LEAF (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC)
41 #endif /* _ASM_RISCV_PGTABLE_BITS_H */