1 /* $NetBSD: ipi.c,v 1.2 2007/10/17 19:56:45 garbled 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 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the NetBSD 20 * Foundation, Inc. and its contributors. 21 * 4. Neither the name of The NetBSD Foundation nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: ipi.c,v 1.2 2007/10/17 19:56:45 garbled Exp $"); 40 41 #include "opt_multiprocessor.h" 42 #include "opt_pic.h" 43 #include "opt_interrupt.h" 44 #include "opt_altivec.h" 45 46 #include <sys/param.h> 47 #include <sys/malloc.h> 48 #include <sys/kernel.h> 49 50 #include <powerpc/atomic.h> 51 #include <powerpc/fpu.h> 52 #include <powerpc/altivec.h> 53 54 #include <arch/powerpc/pic/picvar.h> 55 #include <arch/powerpc/pic/ipivar.h> 56 #include "opt_ipi.h" 57 58 #ifdef MULTIPROCESSOR 59 60 struct ipi_ops ipiops; 61 volatile u_long IPI[CPU_MAXNUM]; 62 63 /* Process an actual IPI */ 64 65 int 66 ppcipi_intr(void *v) 67 { 68 int cpu_id = cpu_number(); 69 int msr; 70 u_long ipi; 71 72 curcpu()->ci_ev_ipi.ev_count++; 73 ipi = atomic_loadlatch_ulong(&IPI[cpu_id], 0); 74 75 if (ipi == PPC_IPI_NOMESG) 76 return 1; 77 78 if (ipi & PPC_IPI_FLUSH_FPU) 79 save_fpu_cpu(); 80 81 #ifdef ALTIVEC 82 if (ipi & PPC_IPI_FLUSH_VEC) 83 save_vec_cpu(); 84 #endif 85 86 if (ipi & PPC_IPI_HALT) { 87 aprint_normal("halting CPU %d\n", cpu_id); 88 msr = (mfmsr() & ~PSL_EE) | PSL_POW; 89 for (;;) { 90 __asm volatile ("sync; isync"); 91 mtmsr(msr); 92 } 93 } 94 return 1; 95 } 96 97 #endif /*MULTIPROCESSOR*/ 98