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  1. /*
  2.  * Copyright (C) 2006 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. /** @addtogroup sparc64mm  
  30.  * @{
  31.  */
  32. /**
  33.  * @file
  34.  * @brief   D-cache shootdown algorithm.
  35.  */
  36.  
  37. #include <arch/mm/cache.h>
  38.  
  39. #ifdef CONFIG_SMP
  40.  
  41. #include <smp/ipi.h>
  42. #include <arch/interrupt.h>
  43. #include <synch/spinlock.h>
  44. #include <arch.h>
  45. #include <debug.h>
  46.  
  47. /**
  48.  * This spinlock is used by the processors to synchronize during the D-cache
  49.  * shootdown.
  50.  */
  51. SPINLOCK_INITIALIZE(dcachelock);
  52.  
  53. /** Initialize the D-cache shootdown sequence.
  54.  *
  55.  * Start the shootdown sequence by sending out an IPI and wait until all
  56.  * processors spin on the dcachelock spinlock.
  57.  */
  58. void dcache_shootdown_start(void)
  59. {
  60.     int i;
  61.  
  62.     CPU->arch.dcache_active = 0;
  63.     spinlock_lock(&dcachelock);
  64.  
  65.     ipi_broadcast(IPI_DCACHE_SHOOTDOWN);   
  66.  
  67. busy_wait:
  68.     for (i = 0; i < config.cpu_count; i++)
  69.         if (cpus[i].arch.dcache_active)
  70.             goto busy_wait;
  71. }
  72.  
  73. /** Finish the D-cache shootdown sequence. */
  74. void dcache_shootdown_finalize(void)
  75. {
  76.     spinlock_unlock(&dcachelock);
  77.     CPU->arch.dcache_active = 1;
  78. }
  79.  
  80. /** Process the D-cache shootdown IPI. */
  81. void dcache_shootdown_ipi_recv(void)
  82. {
  83.     ASSERT(CPU);
  84.  
  85.     CPU->arch.dcache_active = 0;
  86.     spinlock_lock(&dcachelock);
  87.     spinlock_unlock(&dcachelock);
  88.    
  89.     dcache_flush();
  90.  
  91.     CPU->arch.dcache_active = 1;
  92. }
  93.  
  94. #endif /* CONFIG_SMP */
  95.  
  96. /** @}
  97.  */
  98.  
  99.