1 /* 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. 6 * 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. 11 * 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 15 * 16 * ia64 kernel NUMA specific stuff 17 * 18 * Copyright (C) 2002 Erich Focht <efocht@ess.nec.de> 19 * Copyright (C) 2004 Silicon Graphics, Inc. 20 * Jesse Barnes <jbarnes@sgi.com> 21 */ 22 #include <linux/topology.h> 23 #include <linux/module.h> 24 #include <asm/processor.h> 25 #include <asm/smp.h> 26 27 u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned; 28 EXPORT_SYMBOL(cpu_to_node_map); 29 30 cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned; 31 32 /** 33 * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays 34 * 35 * Build cpu to node mapping and initialize the per node cpu masks using 36 * info from the node_cpuid array handed to us by ACPI. 37 */ 38 void __init build_cpu_to_node_map(void) 39 { 40 int cpu, i, node; 41 42 for(node=0; node < MAX_NUMNODES; node++) 43 cpus_clear(node_to_cpu_mask[node]); 44 45 for(cpu = 0; cpu < NR_CPUS; ++cpu) { 46 node = -1; 47 for (i = 0; i < NR_CPUS; ++i) 48 if (cpu_physical_id(cpu) == node_cpuid[i].phys_id) { 49 node = node_cpuid[i].nid; 50 break; 51 } 52 cpu_to_node_map[cpu] = (node >= 0) ? node : 0; 53 if (node >= 0) 54 cpu_set(cpu, node_to_cpu_mask[node]); 55 } 56 } 57