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      (1 << 8)    /* Reserved for software */
20 
21 #define _PAGE_SPECIAL   _PAGE_SOFT
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