projects / mirror_ubuntu-kernels.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 */ |