/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <sys/types.h>
#include <sys/param.h>
#include <sys/thread.h>
#include <sys/cpuvar.h>
#include <sys/machsystm.h>
#include <sys/systm.h>
#include <sys/promif.h>
#include <sys/x_call.h>

/*
 * Interrupt another CPU.
 * 	This is useful to make the other CPU go through a trap so that
 *	it recognizes an address space trap (AST) for preempting a thread.
 *
 *	It is possible to be preempted here and be resumed on the CPU
 *	being poked, so it isn't an error to poke the current CPU.
 *	We could check this and still get preempted after the check, so
 *	we don't bother.
 */
void
poke_cpu(int cpun)
{
	if (panicstr)
		return;
	/*
	 * We don't need to receive an ACK from the CPU being poked,
	 * so just send out a directed interrupt.
	 */
	XC_TRACE(TT_XC_POKE_CPU, -1, cpun);
	send_dirint(cpun, XC_CPUPOKE_PIL);
}