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nodedata.h
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1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License. See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (c) 2000 Silicon Graphics, Inc. All rights reserved.
7  * Copyright (c) 2002 NEC Corp.
8  * Copyright (c) 2002 Erich Focht <[email protected]>
9  * Copyright (c) 2002 Kimio Suganuma <[email protected]>
10  */
11 #ifndef _ASM_IA64_NODEDATA_H
12 #define _ASM_IA64_NODEDATA_H
13 
14 #include <linux/numa.h>
15 
16 #include <asm/percpu.h>
17 #include <asm/mmzone.h>
18 
19 #ifdef CONFIG_NUMA
20 
21 /*
22  * Node Data. One of these structures is located on each node of a NUMA system.
23  */
24 
25 struct pglist_data;
26 struct ia64_node_data {
27  short active_cpu_count;
28  short node;
29  struct pglist_data *pg_data_ptrs[MAX_NUMNODES];
30 };
31 
32 
33 /*
34  * Return a pointer to the node_data structure for the executing cpu.
35  */
36 #define local_node_data (local_cpu_data->node_data)
37 
38 /*
39  * Given a node id, return a pointer to the pg_data_t for the node.
40  *
41  * NODE_DATA - should be used in all code not related to system
42  * initialization. It uses pernode data structures to minimize
43  * offnode memory references. However, these structure are not
44  * present during boot. This macro can be used once cpu_init
45  * completes.
46  */
47 #define NODE_DATA(nid) (local_node_data->pg_data_ptrs[nid])
48 
49 /*
50  * LOCAL_DATA_ADDR - This is to calculate the address of other node's
51  * "local_node_data" at hot-plug phase. The local_node_data
52  * is pointed by per_cpu_page. Kernel usually use it for
53  * just executing cpu. However, when new node is hot-added,
54  * the addresses of local data for other nodes are necessary
55  * to update all of them.
56  */
57 #define LOCAL_DATA_ADDR(pgdat) \
58  ((struct ia64_node_data *)((u64)(pgdat) + \
59  L1_CACHE_ALIGN(sizeof(struct pglist_data))))
60 
61 #endif /* CONFIG_NUMA */
62 
63 #endif /* _ASM_IA64_NODEDATA_H */