36 lines
857 B
C
36 lines
857 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_SPARSEMEM_H
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#define __ASM_SPARSEMEM_H
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#define MAX_PHYSMEM_BITS CONFIG_ARM64_PA_BITS
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/*
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* Section size must be at least 512MB for 64K base
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* page size config. Otherwise it will be less than
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* (MAX_ORDER - 1) and the build process will fail.
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*/
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#ifdef CONFIG_ARM64_64K_PAGES
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#define SECTION_SIZE_BITS 29
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#elif defined(CONFIG_ARM64_MEMMAP_ON_MEMORY)
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/*
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* mhp_supports_memmap_on_memory() requires memmap size to be aligned to
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* pageblock_order.
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*/
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#define SECTION_SIZE_BITS 28
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#else
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/*
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* Section size must be at least 128MB for 4K base
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* page size config. Otherwise PMD based huge page
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* entries could not be created for vmemmap mappings.
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* 16K follows 4K for simplicity.
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*/
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#define SECTION_SIZE_BITS 27
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#endif /* CONFIG_ARM64_64K_PAGES */
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#endif
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