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 2009 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include <sys/types.h> 28 #include <sys/param.h> 29 #include <sys/thread.h> 30 #include <sys/cpuvar.h> 31 #include <sys/machsystm.h> 32 #include <sys/systm.h> 33 #include <sys/promif.h> 34 #include <sys/xc_levels.h> 35 #include <sys/spl.h> 36 #include <sys/bitmap.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 send_dirint(cpun, XC_CPUPOKE_PIL); 58 } 59 60 /* 61 * Call a function on a target CPU 62 */ 63 void 64 cpu_call(cpu_t *cp, cpu_call_func_t func, uintptr_t arg1, uintptr_t arg2) 65 { 66 cpuset_t set; 67 68 if (panicstr) 69 return; 70 71 /* 72 * Prevent CPU from going off-line 73 */ 74 kpreempt_disable(); 75 76 /* 77 * If we are on the target CPU, call the function directly, but raise 78 * the PIL to XC_PIL. 79 * This guarantees that functions called via cpu_call() can not ever 80 * interrupt each other. 81 */ 82 if (CPU == cp) { 83 int save_spl = splr(ipltospl(XC_HI_PIL)); 84 85 (*func)(arg1, arg2); 86 splx(save_spl); 87 } else { 88 CPUSET_ONLY(set, cp->cpu_id); 89 xc_call((xc_arg_t)arg1, (xc_arg_t)arg2, 0, CPUSET2BV(set), 90 (xc_func_t)func); 91 } 92 kpreempt_enable(); 93 } 94