1#ifndef _ASM_X86_64_SPARSEMEM_H
2#define _ASM_X86_64_SPARSEMEM_H 1
3
4#ifdef CONFIG_SPARSEMEM
5
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
18#define SECTION_SIZE_BITS	27 /* matt - 128 is convenient right now */
19#define MAX_PHYSADDR_BITS	40
20#define MAX_PHYSMEM_BITS	40
21
22extern int early_pfn_to_nid(unsigned long pfn);
23
24#endif /* CONFIG_SPARSEMEM */
25
26#endif /* _ASM_X86_64_SPARSEMEM_H */
27