1/* 2 * arch/i386/kernel/topology.c - Populate sysfs with topology information 3 * 4 * Written by: Matthew Dobson, IBM Corporation 5 * Original Code: Paul Dorwin, IBM Corporation, Patrick Mochel, OSDL 6 * 7 * Copyright (C) 2002, IBM Corp. 8 * 9 * All rights reserved. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, but 17 * WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 19 * NON INFRINGEMENT. See the GNU General Public License for more 20 * details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 * 26 * Send feedback to <colpatch@us.ibm.com> 27 */ 28#include <linux/init.h> 29#include <linux/smp.h> 30#include <linux/nodemask.h> 31#include <linux/mmzone.h> 32#include <asm/cpu.h> 33 34static struct i386_cpu cpu_devices[NR_CPUS]; 35 36int arch_register_cpu(int num) 37{ 38 /* 39 * CPU0 cannot be offlined due to several 40 * restrictions and assumptions in kernel. This basically 41 * doesnt add a control file, one cannot attempt to offline 42 * BSP. 43 * 44 * Also certain PCI quirks require not to enable hotplug control 45 * for all CPU's. 46 */ 47 if (num && enable_cpu_hotplug) 48 cpu_devices[num].cpu.hotpluggable = 1; 49 50 return register_cpu(&cpu_devices[num].cpu, num); 51} 52 53#ifdef CONFIG_HOTPLUG_CPU 54int enable_cpu_hotplug = 1; 55 56void arch_unregister_cpu(int num) { 57 return unregister_cpu(&cpu_devices[num].cpu); 58} 59EXPORT_SYMBOL(arch_register_cpu); 60EXPORT_SYMBOL(arch_unregister_cpu); 61#endif /*CONFIG_HOTPLUG_CPU*/ 62 63static int __init topology_init(void) 64{ 65 int i; 66 67#ifdef CONFIG_NUMA 68 for_each_online_node(i) 69 register_one_node(i); 70#endif /* CONFIG_NUMA */ 71 72 for_each_present_cpu(i) 73 arch_register_cpu(i); 74 return 0; 75} 76 77subsys_initcall(topology_init); 78