1 /* $NetBSD: ipi.c,v 1.7 2011/01/18 02:25:42 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 1.7 2011/01/18 02:25:42 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 43 #include <powerpc/atomic.h> 44 #include <powerpc/fpu.h> 45 #include <powerpc/altivec.h> 46 47 #include <arch/powerpc/pic/picvar.h> 48 #include <arch/powerpc/pic/ipivar.h> 49 #include "opt_ipi.h" 50 51 #ifdef MULTIPROCESSOR 52 53 struct ipi_ops ipiops; 54 volatile u_long IPI[CPU_MAXNUM]; 55 56 /* Process an actual IPI */ 57 58 int 59 ppcipi_intr(void *v) 60 { 61 int cpu_id = curcpu()->ci_index; 62 int msr; 63 u_long ipi; 64 65 curcpu()->ci_ev_ipi.ev_count++; 66 ipi = atomic_loadlatch_ulong(&IPI[cpu_id], 0); 67 68 if (ipi == PPC_IPI_NOMESG) 69 return 1; 70 71 if (ipi & PPC_IPI_FLUSH_FPU) 72 fpu_save_cpu(FPU_SAVE_AND_RELEASE); 73 74 #ifdef ALTIVEC 75 if (ipi & PPC_IPI_FLUSH_VEC) 76 vec_save_cpu(VEC_SAVE_AND_RELEASE); 77 #endif 78 79 if (ipi & PPC_IPI_XCALL) 80 xc_ipi_handler(); 81 82 if (ipi & PPC_IPI_HALT) { 83 aprint_normal("halting CPU %d\n", cpu_id); 84 msr = (mfmsr() & ~PSL_EE) | PSL_POW; 85 for (;;) { 86 __asm volatile ("sync; isync"); 87 mtmsr(msr); 88 } 89 } 90 91 return 1; 92 } 93 94 /* 95 * MD support for xcall(9) interface. 96 */ 97 98 void 99 xc_send_ipi(struct cpu_info *ci) 100 { 101 102 KASSERT(kpreempt_disabled()); 103 KASSERT(curcpu() != ci); 104 105 if (ci) { 106 /* Unicast: remote CPU. */ 107 ppc_send_ipi(ci->ci_cpuid, PPC_IPI_XCALL); 108 } else { 109 /* Broadcast: all, but local CPU (caller will handle it). */ 110 ppc_send_ipi(IPI_T_NOTME, PPC_IPI_XCALL); 111 } 112 } 113 114 #endif /*MULTIPROCESSOR*/ 115