1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2012 ARM Ltd.
5 #ifndef __ASM_SPARSEMEM_H
6 #define __ASM_SPARSEMEM_H
8 #ifdef CONFIG_SPARSEMEM
9 #define MAX_PHYSMEM_BITS CONFIG_ARM64_PA_BITS
12 * Section size must be at least 512MB for 64K base
13 * page size config. Otherwise it will be less than
14 * (MAX_ORDER - 1) and the build process will fail.
16 #ifdef CONFIG_ARM64_64K_PAGES
17 #define SECTION_SIZE_BITS 29
22 * Section size must be at least 128MB for 4K base
23 * page size config. Otherwise PMD based huge page
24 * entries could not be created for vmemmap mappings.
25 * 16K follows 4K for simplicity.
27 #define SECTION_SIZE_BITS 27
28 #endif /* CONFIG_ARM64_64K_PAGES */
30 #endif /* CONFIG_SPARSEMEM*/