sparsemem.h

 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#include <asm/pgtable-prot.h>
 9
10#define MAX_PHYSMEM_BITS		PHYS_MASK_SHIFT
11#define MAX_POSSIBLE_PHYSMEM_BITS	(52)
12
13/*
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.
17 */
18#ifdef CONFIG_ARM64_64K_PAGES
19#define SECTION_SIZE_BITS 29
20
21#else
22
23/*
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.
28 */
29#define SECTION_SIZE_BITS 27
30#endif /* CONFIG_ARM64_64K_PAGES */
31
32#endif