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 <efocht@ess.nec.de>
9 * Copyright (c) 2002 Kimio Suganuma <k-suganuma@da.jp.nec.com>
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 */