1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012 ARM Ltd. 4 */ 5 #ifndef __ASM_SPARSEMEM_H 6 #define __ASM_SPARSEMEM_H 7 8 #define MAX_PHYSMEM_BITS CONFIG_ARM64_PA_BITS 9 10 /* 11 * Section size must be at least 512MB for 64K base 12 * page size config. Otherwise it will be less than 13 * (MAX_ORDER - 1) and the build process will fail. 14 */ 15 #ifdef CONFIG_ARM64_64K_PAGES 16 #define SECTION_SIZE_BITS 29 17 18 #else 19 20 /* 21 * Section size must be at least 128MB for 4K base 22 * page size config. Otherwise PMD based huge page 23 * entries could not be created for vmemmap mappings. 24 * 16K follows 4K for simplicity. 25 */ 26 #define SECTION_SIZE_BITS 27 27 #endif /* CONFIG_ARM64_64K_PAGES */ 28 29 #endif 30