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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2019 Western Digital Corporation or its affiliates.
4 */
5
6#ifndef _ASM_RISCV_FIXMAP_H
7#define _ASM_RISCV_FIXMAP_H
8
9#include <linux/kernel.h>
10#include <linux/sizes.h>
11#include <linux/pgtable.h>
12#include <asm/page.h>
13
14#ifdef CONFIG_MMU
15/*
16 * Here we define all the compile-time 'special' virtual addresses.
17 * The point is to have a constant address at compile time, but to
18 * set the physical address only in the boot process.
19 *
20 * These 'compile-time allocated' memory buffers are page-sized. Use
21 * set_fixmap(idx,phys) to associate physical memory with fixmap indices.
22 */
23enum fixed_addresses {
24 FIX_HOLE,
25 FIX_PTE,
26 FIX_PMD,
27 FIX_TEXT_POKE1,
28 FIX_TEXT_POKE0,
29 FIX_EARLYCON_MEM_BASE,
30
31 __end_of_permanent_fixed_addresses,
32 /*
33 * Temporary boot-time mappings, used by early_ioremap(),
34 * before ioremap() is functional.
35 */
36#define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE)
37#define FIX_BTMAPS_SLOTS 7
38#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
39
40 FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
41 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
42
43 __end_of_fixed_addresses
44};
45
46#define FIXMAP_PAGE_IO PAGE_KERNEL
47
48#define __early_set_fixmap __set_fixmap
49
50#define __late_set_fixmap __set_fixmap
51#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
52
53extern void __set_fixmap(enum fixed_addresses idx,
54 phys_addr_t phys, pgprot_t prot);
55
56#include <asm-generic/fixmap.h>
57
58#endif /* CONFIG_MMU */
59#endif /* _ASM_RISCV_FIXMAP_H */