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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1965aae3 PA |
2 | #ifndef _ASM_X86_SPARSEMEM_H |
3 | #define _ASM_X86_SPARSEMEM_H | |
8a423ff0 TG |
4 | |
5 | #ifdef CONFIG_SPARSEMEM | |
6 | /* | |
7 | * generic non-linear memory support: | |
8 | * | |
9 | * 1) we will not split memory into more chunks than will fit into the flags | |
10 | * field of the struct page | |
11 | * | |
12 | * SECTION_SIZE_BITS 2^n: size of each section | |
13 | * MAX_PHYSADDR_BITS 2^n: max size of physical address space | |
14 | * MAX_PHYSMEM_BITS 2^n: how much memory we can have in that space | |
15 | * | |
16 | */ | |
17 | ||
96a388de | 18 | #ifdef CONFIG_X86_32 |
8a423ff0 | 19 | # ifdef CONFIG_X86_PAE |
fb8e8375 | 20 | # define SECTION_SIZE_BITS 29 |
8a423ff0 TG |
21 | # define MAX_PHYSADDR_BITS 36 |
22 | # define MAX_PHYSMEM_BITS 36 | |
23 | # else | |
24 | # define SECTION_SIZE_BITS 26 | |
25 | # define MAX_PHYSADDR_BITS 32 | |
26 | # define MAX_PHYSMEM_BITS 32 | |
27 | # endif | |
28 | #else /* CONFIG_X86_32 */ | |
29 | # define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */ | |
4c7c4483 KS |
30 | # ifdef CONFIG_X86_5LEVEL |
31 | # define MAX_PHYSADDR_BITS 52 | |
32 | # define MAX_PHYSMEM_BITS 52 | |
33 | # else | |
34 | # define MAX_PHYSADDR_BITS 44 | |
35 | # define MAX_PHYSMEM_BITS 46 | |
36 | # endif | |
8a423ff0 TG |
37 | #endif |
38 | ||
39 | #endif /* CONFIG_SPARSEMEM */ | |
1965aae3 | 40 | #endif /* _ASM_X86_SPARSEMEM_H */ |