1 /* 2 * 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/interrupt.h> 29 #include <linux/nodemask.h> 30 #include <linux/export.h> 31 #include <linux/mmzone.h> 32 #include <linux/init.h> 33 #include <linux/smp.h> 34 #include <linux/irq.h> 35 #include <asm/io_apic.h> 36 #include <asm/cpu.h> 37 38 static DEFINE_PER_CPU(struct x86_cpu, cpu_devices); 39 40 #ifdef CONFIG_HOTPLUG_CPU 41 int arch_register_cpu(int cpu) 42 { 43 struct x86_cpu *xc = per_cpu_ptr(&cpu_devices, cpu); 44 45 xc->cpu.hotpluggable = cpu > 0; 46 return register_cpu(&xc->cpu, cpu); 47 } 48 EXPORT_SYMBOL(arch_register_cpu); 49 50 void arch_unregister_cpu(int num) 51 { 52 unregister_cpu(&per_cpu(cpu_devices, num).cpu); 53 } 54 EXPORT_SYMBOL(arch_unregister_cpu); 55 #else /* CONFIG_HOTPLUG_CPU */ 56 57 static int __init arch_register_cpu(int num) 58 { 59 return register_cpu(&per_cpu(cpu_devices, num).cpu, num); 60 } 61 #endif /* CONFIG_HOTPLUG_CPU */ 62 63 static int __init topology_init(void) 64 { 65 int i; 66 67 for_each_present_cpu(i) 68 arch_register_cpu(i); 69 70 return 0; 71 } 72 subsys_initcall(topology_init); 73