1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/types.h> 30 #include <sys/param.h> 31 #include <sys/thread.h> 32 #include <sys/cpuvar.h> 33 #include <sys/machsystm.h> 34 #include <sys/systm.h> 35 #include <sys/promif.h> 36 #include <sys/x_call.h> 37 38 /* 39 * Interrupt another CPU. 40 * This is useful to make the other CPU go through a trap so that 41 * it recognizes an address space trap (AST) for preempting a thread. 42 * 43 * It is possible to be preempted here and be resumed on the CPU 44 * being poked, so it isn't an error to poke the current CPU. 45 * We could check this and still get preempted after the check, so 46 * we don't bother. 47 */ 48 void 49 poke_cpu(int cpun) 50 { 51 if (panicstr) 52 return; 53 /* 54 * We don't need to receive an ACK from the CPU being poked, 55 * so just send out a directed interrupt. 56 */ 57 XC_TRACE(TT_XC_POKE_CPU, -1, cpun); 58 send_dirint(cpun, XC_CPUPOKE_PIL); 59 } 60