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Thomas Gleixner8a423ff2008-01-30 13:30:37 +01001#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
Thomas Gleixner96a388d2007-10-11 11:20:03 +020017#ifdef CONFIG_X86_32
Thomas Gleixner8a423ff2008-01-30 13:30:37 +010018# ifdef CONFIG_X86_PAE
Jeremy Fitzhardingefb8e8372008-03-27 17:28:39 -070019# define SECTION_SIZE_BITS 29
Thomas Gleixner8a423ff2008-01-30 13:30:37 +010020# 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 */
Jack Steiner8434e732008-03-21 08:31:57 -050029# define MAX_PHYSADDR_BITS 44
30# define MAX_PHYSMEM_BITS 44
Thomas Gleixner8a423ff2008-01-30 13:30:37 +010031#endif
32
33#endif /* CONFIG_SPARSEMEM */
Thomas Gleixner96a388d2007-10-11 11:20:03 +020034#endif