2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 * ia64 kernel NUMA specific stuff
18 * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
19 * Copyright (C) 2004 Silicon Graphics, Inc.
20 * Jesse Barnes <jbarnes@sgi.com>
22 #include <linux/config.h>
23 #include <linux/topology.h>
24 #include <linux/module.h>
25 #include <asm/processor.h>
28 u8 cpu_to_node_map[NR_CPUS] __cacheline_aligned;
29 EXPORT_SYMBOL(cpu_to_node_map);
31 cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
34 * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays
36 * Build cpu to node mapping and initialize the per node cpu masks using
37 * info from the node_cpuid array handed to us by ACPI.
39 void __init build_cpu_to_node_map(void)
43 for(node=0; node < MAX_NUMNODES; node++)
44 cpus_clear(node_to_cpu_mask[node]);
46 for(cpu = 0; cpu < NR_CPUS; ++cpu) {
48 for (i = 0; i < NR_CPUS; ++i)
49 if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) {
50 node = node_cpuid[i].nid;
53 cpu_to_node_map[cpu] = (node >= 0) ? node : 0;
55 cpu_set(cpu, node_to_cpu_mask[node]);