tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002
3 *
4 */
5
6#ifndef _ASM_X86_MMZONE_32_H
7#define _ASM_X86_MMZONE_32_H
8
9#include <asm/smp.h>
10
11#ifdef CONFIG_NUMA
12extern struct pglist_data *node_data[];
13#define NODE_DATA(nid) (node_data[nid])
14
15#include <asm/numaq.h>
16
17#endif /* CONFIG_NUMA */
18
19#ifdef CONFIG_DISCONTIGMEM
20
21/*
22 * generic node memory support, the following assumptions apply:
23 *
24 * 1) memory comes in 64Mb contiguous chunks which are either present or not
25 * 2) we will not have more than 64Gb in total
26 *
27 * for now assume that 64Gb is max amount of RAM for whole system
28 * 64Gb / 4096bytes/page = 16777216 pages
29 */
30#define MAX_NR_PAGES 16777216
31#define MAX_SECTIONS 1024
32#define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS)
33
34extern s8 physnode_map[];
35
36static inline int pfn_to_nid(unsigned long pfn)
37{
38#ifdef CONFIG_NUMA
39 return((int) physnode_map[(pfn) / PAGES_PER_SECTION]);
40#else
41 return 0;
42#endif
43}
44
45static inline int pfn_valid(int pfn)
46{
47 int nid = pfn_to_nid(pfn);
48
49 if (nid >= 0)
50 return (pfn < node_end_pfn(nid));
51 return 0;
52}
53
54#define early_pfn_valid(pfn) pfn_valid((pfn))
55
56#endif /* CONFIG_DISCONTIGMEM */
57
58#endif /* _ASM_X86_MMZONE_32_H */