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/config.h> 23 #include <linux/topology.h> 24 #include <linux/module.h> 25 #include <asm/processor.h> 26 #include <asm/smp.h> 27 28 u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned; 29 EXPORT_SYMBOL(cpu_to_node_map); 30 31 cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned; 32 33 /** 34 * build_cpu_to_node_map - setup cpu to node and node to cpumask arrays 35 * 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. 38 */ 39 void __init build_cpu_to_node_map(void) 40 { 41 int cpu, i, node; 42 43 for(node=0; node < MAX_NUMNODES; node++) 44 cpus_clear(node_to_cpu_mask[node]); 45 46 for(cpu = 0; cpu < NR_CPUS; ++cpu) { 47 node = -1; 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; 51 break; 52 } 53 cpu_to_node_map[cpu] = (node >= 0) ? node : 0; 54 if (node >= 0) 55 cpu_set(cpu, node_to_cpu_mask[node]); 56 } 57 } 58