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# define MAX_PHYSADDR_BITS	44
30# define MAX_PHYSMEM_BITS	46
31#endif
32
33#endif /* CONFIG_SPARSEMEM */
34#endif /* _ASM_X86_SPARSEMEM_H */
35