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 #include <asm/pgtable-prot.h>
10 #define MAX_PHYSMEM_BITS PHYS_MASK_SHIFT
11 #define MAX_POSSIBLE_PHYSMEM_BITS (52)
14 * Section size must be at least 512MB for 64K base
15 * page size config. Otherwise it will be less than
16 * MAX_PAGE_ORDER and the build process will fail.
18 #ifdef CONFIG_ARM64_64K_PAGES
19 #define SECTION_SIZE_BITS 29
24 * Section size must be at least 128MB for 4K base
25 * page size config. Otherwise PMD based huge page
26 * entries could not be created for vmemmap mappings.
27 * 16K follows 4K for simplicity.
29 #define SECTION_SIZE_BITS 27
30 #endif /* CONFIG_ARM64_64K_PAGES */