| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef _ASM_X86_SPARSEMEM_H |
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| 3 | #define _ASM_X86_SPARSEMEM_H |
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| 4 | |
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| 5 | #include <linux/types.h> |
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| 6 | |
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| 7 | #ifdef CONFIG_SPARSEMEM |
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| 8 | /* |
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| 9 | * generic non-linear memory support: |
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| 10 | * |
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| 11 | * 1) we will not split memory into more chunks than will fit into the flags |
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| 12 | * field of the struct page |
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| 13 | * |
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| 14 | * SECTION_SIZE_BITS 2^n: size of each section |
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| 15 | * MAX_PHYSMEM_BITS 2^n: max size of physical address space |
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| 16 | * |
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| 17 | */ |
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| 18 | |
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| 19 | #ifdef CONFIG_X86_32 |
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| 20 | # ifdef CONFIG_X86_PAE |
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| 21 | # define SECTION_SIZE_BITS 29 |
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| 22 | # define MAX_PHYSMEM_BITS 36 |
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| 23 | # else |
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| 24 | # define SECTION_SIZE_BITS 26 |
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| 25 | # define MAX_PHYSMEM_BITS 32 |
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| 26 | # endif |
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| 27 | #else /* CONFIG_X86_32 */ |
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| 28 | # define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */ |
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| 29 | # define MAX_PHYSMEM_BITS (pgtable_l5_enabled() ? 52 : 46) |
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| 30 | #endif |
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| 31 | |
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| 32 | #endif /* CONFIG_SPARSEMEM */ |
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| 33 | |
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| 34 | #endif /* _ASM_X86_SPARSEMEM_H */ |
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| 35 | |
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