summaryrefslogtreecommitdiffstats
path: root/arch/arm64/include/asm/sparsemem.h
blob: 4b73463423c3108c1d14995aa43186e31601d633 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 ARM Ltd.
 */
#ifndef __ASM_SPARSEMEM_H
#define __ASM_SPARSEMEM_H

#define MAX_PHYSMEM_BITS	CONFIG_ARM64_PA_BITS

/*
 * Section size must be at least 512MB for 64K base
 * page size config. Otherwise it will be less than
 * (MAX_ORDER - 1) and the build process will fail.
 */
#ifdef CONFIG_ARM64_64K_PAGES
#define SECTION_SIZE_BITS 29

#else

/*
 * Section size must be at least 128MB for 4K base
 * page size config. Otherwise PMD based huge page
 * entries could not be created for vmemmap mappings.
 * 16K follows 4K for simplicity.
 */
#define SECTION_SIZE_BITS 27
#endif /* CONFIG_ARM64_64K_PAGES */

#endif