Linux kernel mirror (for testing)
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1#ifndef _ASM_X86_SPARSEMEM_H
2#define _ASM_X86_SPARSEMEM_H
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
17#ifdef CONFIG_X86_32
18# ifdef CONFIG_X86_PAE
19# define SECTION_SIZE_BITS 29
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 */
29# ifdef CONFIG_X86_5LEVEL
30# define MAX_PHYSADDR_BITS 52
31# define MAX_PHYSMEM_BITS 52
32# else
33# define MAX_PHYSADDR_BITS 44
34# define MAX_PHYSMEM_BITS 46
35# endif
36#endif
37
38#endif /* CONFIG_SPARSEMEM */
39#endif /* _ASM_X86_SPARSEMEM_H */