pgtable-32.h

 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
36static const __maybe_unused int pgtable_l4_enabled;
37static const __maybe_unused int pgtable_l5_enabled;
38
39#endif /* _ASM_RISCV_PGTABLE_32_H */