source: mainline/kernel/generic/src/smp/ipi.c@ 26d3ae2

/*
 * Copyright (c) 2005 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup generic
 * @{
 */

/**
 * @file
 * @brief Generic IPI interface.
 */

#ifdef CONFIG_SMP

#include <smp/ipi.h>
#include <config.h>

/** Broadcast IPI message
 *
 * Broadcast IPI message to all CPUs.
 *
 * @param ipi Message to broadcast.
 *
 * @bug The decision whether to actually send the IPI must be based
 *      on a different criterion. The current version has
 *      problems when some of the detected CPUs are marked
 *      disabled in machine configuration.
 */
void ipi_broadcast(int ipi)
{
        /*
         * Provisions must be made to avoid sending IPI:
         * - before all CPU's were configured to accept the IPI
         * - if there is only one CPU but the kernel was compiled with CONFIG_SMP
         */
        
        if ((config.cpu_active > 1) && (config.cpu_active == config.cpu_count))
                ipi_broadcast_arch(ipi);
}

#endif /* CONFIG_SMP */

/** @}
 */