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1965aae3 PA |
1 | #ifndef _ASM_X86_SPARSEMEM_H |
2 | #define _ASM_X86_SPARSEMEM_H | |
8a423ff0 TG |
3 | |
4 | #ifdef CONFIG_SPARSEMEM | |
5 | /* | |
6 | * generic non-linear memory support: | |
7 | * | |
8 | * 1) we will not split memory into more chunks than will fit into the flags | |
9 | * field of the struct page | |
10 | * | |
11 | * SECTION_SIZE_BITS 2^n: size of each section | |
12 | * MAX_PHYSADDR_BITS 2^n: max size of physical address space | |
13 | * MAX_PHYSMEM_BITS 2^n: how much memory we can have in that space | |
14 | * | |
15 | */ | |
16 | ||
96a388de | 17 | #ifdef CONFIG_X86_32 |
8a423ff0 | 18 | # ifdef CONFIG_X86_PAE |
fb8e8375 | 19 | # define SECTION_SIZE_BITS 29 |
8a423ff0 TG |
20 | # define MAX_PHYSADDR_BITS 36 |
21 | # define MAX_PHYSMEM_BITS 36 | |
22 | # else | |
23 | # define SECTION_SIZE_BITS 26 | |
24 | # define MAX_PHYSADDR_BITS 32 | |
25 | # define MAX_PHYSMEM_BITS 32 | |
26 | # endif | |
27 | #else /* CONFIG_X86_32 */ | |
28 | # define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */ | |
8434e73d | 29 | # define MAX_PHYSADDR_BITS 44 |
c898faf9 | 30 | # define MAX_PHYSMEM_BITS 46 |
8a423ff0 TG |
31 | #endif |
32 | ||
33 | #endif /* CONFIG_SPARSEMEM */ | |
1965aae3 | 34 | #endif /* _ASM_X86_SPARSEMEM_H */ |