1/* $NetBSD: cpu_mainbus.c,v 1.19 2024/05/09 12:41:08 pho Exp $ */ 2 3/* 4 * Copyright (c) 1995 Mark Brinicombe. 5 * Copyright (c) 1995 Brini. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Brini. 19 * 4. The name of the company nor the name of the author may be used to 20 * endorse or promote products derived from this software without specific 21 * prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY BRINI ``AS IS'' AND ANY EXPRESS OR IMPLIED 24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL BRINI OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * RiscBSD kernel project 36 * 37 * cpu.c 38 * 39 * Probing and configuration for the master cpu 40 * 41 * Created : 10/10/95 42 */ 43 44#include "locators.h" 45#include "opt_multiprocessor.h" 46 47#include <sys/cdefs.h> 48__KERNEL_RCSID(0, "$NetBSD: cpu_mainbus.c,v 1.19 2024/05/09 12:41:08 pho Exp $"); 49 50#include <sys/param.h> 51#include <sys/types.h> 52#include <sys/systm.h> 53#include <sys/cpu.h> 54#include <sys/device.h> 55#include <sys/proc.h> 56 57#include <arm/cpuvar.h> 58#include <arm/mainbus/mainbus.h> 59 60/* 61 * Prototypes 62 */ 63static int cpu_mainbus_match(device_t, cfdata_t, void *); 64static void cpu_mainbus_attach(device_t, device_t, void *); 65 66/* 67 * int cpumatch(device_t parent, cfdata_t cf, void *aux) 68 * 69 * Probe for the main cpu. Currently all this does is return 1 to 70 * indicate that the cpu was found. 71 */ 72#ifndef MULTIPROCESSOR 73#define arm_cpu_max 1 74#endif 75 76static int 77cpu_mainbus_match(device_t parent, cfdata_t cf, void *aux) 78{ 79 struct mainbus_attach_args * const mb = aux; 80 int id = mb->mb_core; 81 82 if (id != MAINBUSCF_CORE_DEFAULT) { 83 if (id == 0) 84 return cpu_info_store[0].ci_dev == NULL; 85 if (id >= arm_cpu_max) 86 return 0; 87#ifdef MULTIPROCESSOR 88 if (cpu_info[id] != NULL) 89 return 0; 90#endif 91 return 1; 92 } 93 94 if (cpu_info_store[0].ci_dev == NULL) { 95 mb->mb_core = 0; 96 return 1; 97 } 98 99#ifdef MULTIPROCESSOR 100 for (id = 1; id < arm_cpu_max; id++) { 101 if (cpu_info[id] != NULL) 102 continue; 103 mb->mb_core = id; 104 return 1; 105 } 106#endif 107 108 return 0; 109} 110 111/* 112 * void cpusattach(device_t parent, device_t dev, void *aux) 113 * 114 * Attach the main cpu 115 */ 116 117static void 118cpu_mainbus_attach(device_t parent, device_t self, void *aux) 119{ 120 struct mainbus_attach_args * const mb = aux; 121 122 cpu_attach(self, mb->mb_core); 123} 124 125CFATTACH_DECL2_NEW(cpu_mainbus, 0, 126 cpu_mainbus_match, cpu_mainbus_attach, NULL, NULL, 127 cpu_rescan, cpu_childdetached); 128