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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_32_H
7#define _ASM_RISCV_PGTABLE_32_H
8
9#include <asm-generic/pgtable-nopmd.h>
10#include <linux/bits.h>
11#include <linux/const.h>
12
13/* Size of region mapped by a page global directory */
14#define PGDIR_SHIFT 22
15#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
16#define PGDIR_MASK (~(PGDIR_SIZE - 1))
17
18#define MAX_POSSIBLE_PHYSMEM_BITS 34
19
20/*
21 * rv32 PTE format:
22 * | XLEN-1 10 | 9 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
23 * PFN reserved for SW D A G U X W R V
24 */
25#define _PAGE_PFN_MASK GENMASK(31, 10)
26
27#define _PAGE_NOCACHE 0
28#define _PAGE_IO 0
29#define _PAGE_MTMASK 0
30
31/* Set of bits to preserve across pte_modify() */
32#define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \
33 _PAGE_WRITE | _PAGE_EXEC | \
34 _PAGE_USER | _PAGE_GLOBAL))
35
36#endif /* _ASM_RISCV_PGTABLE_32_H */