1 /* $NetBSD: ipi.c,v 1.10 2011/06/20 06:23:52 matt Exp $ */ 2 /*- 3 * Copyright (c) 2007 The NetBSD Foundation, Inc. 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to The NetBSD Foundation 7 * by Tim Rightnour 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28 * POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __KERNEL_RCSID(0, "$NetBSD: ipi.c,v 1.10 2011/06/20 06:23:52 matt Exp $"); 33 34 #include "opt_multiprocessor.h" 35 #include "opt_pic.h" 36 #include "opt_interrupt.h" 37 #include "opt_altivec.h" 38 39 #include <sys/param.h> 40 #include <sys/kernel.h> 41 #include <sys/xcall.h> 42 #include <sys/atomic.h> 43 #include <sys/cpu.h> 44 45 #include <powerpc/psl.h> 46 47 #include <powerpc/pic/picvar.h> 48 #include <powerpc/pic/ipivar.h> 49 #include "opt_ipi.h" 50 51 #ifdef MULTIPROCESSOR 52 53 struct ipi_ops ipiops; 54 55 /* Process an actual IPI */ 56 57 int 58 ipi_intr(void *v) 59 { 60 struct cpu_info * const ci = curcpu(); 61 int cpu_id = cpu_index(ci); 62 int msr; 63 uint32_t ipi; 64 65 ci->ci_ev_ipi.ev_count++; 66 ipi = atomic_swap_32(&ci->ci_pending_ipis, 0); 67 68 if (ipi == IPI_NOMESG) 69 return 1; 70 71 if (ipi & IPI_XCALL) 72 xc_ipi_handler(); 73 74 if (ipi & IPI_HALT) { 75 aprint_normal("halting CPU %d\n", cpu_id); 76 msr = (mfmsr() & ~PSL_EE) | PSL_POW; 77 for (;;) { 78 __asm volatile ("sync; isync"); 79 mtmsr(msr); 80 } 81 } 82 83 return 1; 84 } 85 #endif /*MULTIPROCESSOR*/ 86