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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 <synch/spinlock.h>
  31. #include <typedefs.h>
  32. #include <arch/atomic.h>
  33. #include <config.h>
  34.  
  35. #ifdef __SMP__
  36. static spinlock_t tlblock;
  37. static volatile int tlb_shutdown_cnt;
  38.  
  39. void tlb_init(void)
  40. {
  41.     spinlock_initialize(&tlblock);
  42.     tlb_shutdown_cnt = 0;
  43. }
  44.  
  45. /* must be called with interrupts disabled */
  46. void tlb_shutdown_start(void)
  47. {
  48.     spinlock_lock(&tlblock);
  49.     tlb_shutdown_ipi_send();
  50.    
  51.     while (tlb_shutdown_cnt < config.cpu_active - 1)
  52.         ;
  53.        
  54.     tlb_shutdown_cnt = 0;
  55. }
  56.  
  57. void tlb_shutdown_finalize(void)
  58. {
  59.     spinlock_unlock(&tlblock);
  60. }
  61.  
  62. void tlb_shutdown_ipi_recv(void)
  63. {
  64.     atomic_inc((int *) &tlb_shutdown_cnt);
  65.     spinlock_lock(&tlblock);
  66.     spinlock_unlock(&tlblock);
  67.     tlb_invalidate(0);  /* TODO: use valid ASID */
  68. }
  69. #endif /* __SMP__ */
  70.