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  1. /*
  2.  * Copyright (C) 2005 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /**
  30.  * @file    ipi.c
  31.  * @brief   Generic IPI interface.
  32.  */
  33.  
  34. #ifdef CONFIG_SMP
  35.  
  36. #include <smp/ipi.h>
  37. #include <config.h>
  38.  
  39.  
  40. /** Broadcast IPI message
  41.  *
  42.  * Broadcast IPI message to all CPUs.
  43.  *
  44.  * @param ipi Message to broadcast.
  45.  *
  46.  * @bugs The decision whether to actually send the IPI must be based
  47.  *   on a different criterion. The current version has
  48.  *   problems when some of the detected CPUs are marked
  49.  *   disabled in machine configuration.
  50.  */
  51. void ipi_broadcast(int ipi)
  52. {
  53.     /*
  54.      * Provisions must be made to avoid sending IPI:
  55.      * - before all CPU's were configured to accept the IPI
  56.      * - if there is only one CPU but the kernel was compiled with CONFIG_SMP
  57.      */
  58.  
  59.     if ((config.cpu_active > 1) && (config.cpu_active == config.cpu_count))
  60.         ipi_broadcast_arch(ipi);
  61. }
  62.  
  63. #endif /* CONFIG_SMP */
  64.