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  1. /*
  2.  * Copyright (C) 2001-2004 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. #include <mm/tlb.h>
  30. #include <smp/ipi.h>
  31. #include <synch/spinlock.h>
  32. #include <typedefs.h>
  33. #include <arch/atomic.h>
  34. #include <arch/interrupt.h>
  35. #include <config.h>
  36.  
  37. #ifdef __SMP__
  38. static spinlock_t tlblock;
  39. static volatile int tlb_shootdown_cnt;
  40.  
  41. void tlb_init(void)
  42. {
  43.     spinlock_initialize(&tlblock);
  44.     tlb_shootdown_cnt = 0;
  45. }
  46.  
  47. /* must be called with interrupts disabled */
  48. void tlb_shootdown_start(void)
  49. {
  50.     spinlock_lock(&tlblock);
  51.     tlb_shootdown_ipi_send();
  52.    
  53.     while (tlb_shootdown_cnt < config.cpu_active - 1)
  54.         ;
  55.        
  56.     tlb_shootdown_cnt = 0;
  57. }
  58.  
  59. void tlb_shootdown_finalize(void)
  60. {
  61.     spinlock_unlock(&tlblock);
  62. }
  63.  
  64. void tlb_shootdown_ipi_send(void)
  65. {
  66.     ipi_broadcast(VECTOR_TLB_SHOOTDOWN_IPI);
  67. }
  68.  
  69. void tlb_shootdown_ipi_recv(void)
  70. {
  71.     atomic_inc((int *) &tlb_shootdown_cnt);
  72.     spinlock_lock(&tlblock);
  73.     spinlock_unlock(&tlblock);
  74.     tlb_invalidate(0);  /* TODO: use valid ASID */
  75. }
  76. #endif /* __SMP__ */
  77.