1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*7c478bd9Sstevel@tonic-gate * with the License. 8*7c478bd9Sstevel@tonic-gate * 9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 12*7c478bd9Sstevel@tonic-gate * and limitations under the License. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*7c478bd9Sstevel@tonic-gate * 20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END 21*7c478bd9Sstevel@tonic-gate */ 22*7c478bd9Sstevel@tonic-gate /* 23*7c478bd9Sstevel@tonic-gate * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24*7c478bd9Sstevel@tonic-gate * Use is subject to license terms. 25*7c478bd9Sstevel@tonic-gate */ 26*7c478bd9Sstevel@tonic-gate 27*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" 28*7c478bd9Sstevel@tonic-gate 29*7c478bd9Sstevel@tonic-gate /* 30*7c478bd9Sstevel@tonic-gate * Facilities for cross-processor subroutine calls using "mailbox" interrupts. 31*7c478bd9Sstevel@tonic-gate */ 32*7c478bd9Sstevel@tonic-gate 33*7c478bd9Sstevel@tonic-gate #include <sys/types.h> 34*7c478bd9Sstevel@tonic-gate #include <sys/thread.h> 35*7c478bd9Sstevel@tonic-gate #include <sys/cpuvar.h> 36*7c478bd9Sstevel@tonic-gate #include <sys/x_call.h> 37*7c478bd9Sstevel@tonic-gate #include <sys/systm.h> 38*7c478bd9Sstevel@tonic-gate #include <sys/machsystm.h> 39*7c478bd9Sstevel@tonic-gate #include <sys/intr.h> 40*7c478bd9Sstevel@tonic-gate 41*7c478bd9Sstevel@tonic-gate /* 42*7c478bd9Sstevel@tonic-gate * Interrupt another CPU. 43*7c478bd9Sstevel@tonic-gate * This is useful to make the other CPU go through a trap so that 44*7c478bd9Sstevel@tonic-gate * it recognizes an address space trap (AST) for preempting a thread. 45*7c478bd9Sstevel@tonic-gate * 46*7c478bd9Sstevel@tonic-gate * It is possible to be preempted here and be resumed on the CPU 47*7c478bd9Sstevel@tonic-gate * being poked, so it isn't an error to poke the current CPU. 48*7c478bd9Sstevel@tonic-gate * We could check this and still get preempted after the check, so 49*7c478bd9Sstevel@tonic-gate * we don't bother. 50*7c478bd9Sstevel@tonic-gate */ 51*7c478bd9Sstevel@tonic-gate void 52*7c478bd9Sstevel@tonic-gate poke_cpu(int cpun) 53*7c478bd9Sstevel@tonic-gate { 54*7c478bd9Sstevel@tonic-gate uint32_t *ptr = (uint32_t *)&cpu[cpun]->cpu_m.poke_cpu_outstanding; 55*7c478bd9Sstevel@tonic-gate 56*7c478bd9Sstevel@tonic-gate /* 57*7c478bd9Sstevel@tonic-gate * If panicstr is set or a poke_cpu is already pending, 58*7c478bd9Sstevel@tonic-gate * no need to send another one. Use atomic swap to protect 59*7c478bd9Sstevel@tonic-gate * against multiple CPUs sending redundant pokes. 60*7c478bd9Sstevel@tonic-gate */ 61*7c478bd9Sstevel@tonic-gate if (panicstr || *ptr == B_TRUE || 62*7c478bd9Sstevel@tonic-gate atomic_swap_32(ptr, B_TRUE) == B_TRUE) 63*7c478bd9Sstevel@tonic-gate return; 64*7c478bd9Sstevel@tonic-gate 65*7c478bd9Sstevel@tonic-gate xt_one(cpun, setsoftint_tl1, poke_cpu_inum, 0); 66*7c478bd9Sstevel@tonic-gate } 67