1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* |
3 | * Written by Pat Gaughen (gone@us.ibm.com) Mar 2002 |
4 | * |
5 | */ |
6 | |
7 | #ifndef _ASM_X86_MMZONE_32_H |
8 | #define _ASM_X86_MMZONE_32_H |
9 | |
10 | #include <asm/smp.h> |
11 | |
12 | #ifdef CONFIG_NUMA |
13 | extern struct pglist_data *node_data[]; |
14 | #define NODE_DATA(nid) (node_data[nid]) |
15 | #endif /* CONFIG_NUMA */ |
16 | |
17 | #ifdef CONFIG_DISCONTIGMEM |
18 | |
19 | /* |
20 | * generic node memory support, the following assumptions apply: |
21 | * |
22 | * 1) memory comes in 64Mb contiguous chunks which are either present or not |
23 | * 2) we will not have more than 64Gb in total |
24 | * |
25 | * for now assume that 64Gb is max amount of RAM for whole system |
26 | * 64Gb / 4096bytes/page = 16777216 pages |
27 | */ |
28 | #define MAX_NR_PAGES 16777216 |
29 | #define MAX_SECTIONS 1024 |
30 | #define PAGES_PER_SECTION (MAX_NR_PAGES/MAX_SECTIONS) |
31 | |
32 | extern s8 physnode_map[]; |
33 | |
34 | static inline int pfn_to_nid(unsigned long pfn) |
35 | { |
36 | #ifdef CONFIG_NUMA |
37 | return((int) physnode_map[(pfn) / PAGES_PER_SECTION]); |
38 | #else |
39 | return 0; |
40 | #endif |
41 | } |
42 | |
43 | static inline int pfn_valid(int pfn) |
44 | { |
45 | int nid = pfn_to_nid(pfn); |
46 | |
47 | if (nid >= 0) |
48 | return (pfn < node_end_pfn(nid)); |
49 | return 0; |
50 | } |
51 | |
52 | #define early_pfn_valid(pfn) pfn_valid((pfn)) |
53 | |
54 | #endif /* CONFIG_DISCONTIGMEM */ |
55 | |
56 | #endif /* _ASM_X86_MMZONE_32_H */ |
57 | |