/*
 * 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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#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/xc_levels.h>
#include <sys/spl.h>
#include <sys/bitmap.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.
         */
        send_dirint(cpun, XC_CPUPOKE_PIL);
}

/*
 * Call a function on a target CPU
 */
void
cpu_call(cpu_t *cp, cpu_call_func_t func, uintptr_t arg1, uintptr_t arg2)
{
        cpuset_t set;

        if (panicstr)
                return;

        /*
         * Prevent CPU from going off-line
         */
        kpreempt_disable();

        /*
         * If we are on the target CPU, call the function directly, but raise
         * the PIL to XC_PIL.
         * This guarantees that functions called via cpu_call() can not ever
         * interrupt each other.
         */
        if (CPU == cp) {
                int save_spl = splr(ipltospl(XC_HI_PIL));

                (*func)(arg1, arg2);
                splx(save_spl);
        } else {
                CPUSET_ONLY(set, cp->cpu_id);
                xc_call((xc_arg_t)arg1, (xc_arg_t)arg2, 0, CPUSET2BV(set),
                    (xc_func_t)(uintptr_t)func);
        }
        kpreempt_enable();
}