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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 <arch/mm/tlb.h>
  31. #include <smp/ipi.h>
  32. #include <synch/spinlock.h>
  33. #include <typedefs.h>
  34. #include <arch/atomic.h>
  35. #include <arch/interrupt.h>
  36. #include <config.h>
  37. #include <arch.h>
  38.  
  39. #ifdef CONFIG_SMP
  40. static spinlock_t tlblock;
  41. #endif
  42.  
  43. void tlb_init(void)
  44. {
  45.     if (config.cpu_active == 1)
  46.         spinlock_initialize(&tlblock, "tlb_lock");
  47.  
  48.     tlb_init_arch();
  49. }
  50.  
  51. #ifdef CONFIG_SMP
  52. /* must be called with interrupts disabled */
  53. void tlb_shootdown_start(void)
  54. {
  55.     int i;
  56.  
  57.     CPU->tlb_active = 0;
  58.     spinlock_lock(&tlblock);
  59.     tlb_shootdown_ipi_send();
  60.     tlb_invalidate(0); /* TODO: use valid ASID */
  61.    
  62. busy_wait: 
  63.     for (i = 0; i<config.cpu_count; i++)
  64.         if (cpus[i].tlb_active)
  65.             goto busy_wait;
  66. }
  67.  
  68. void tlb_shootdown_finalize(void)
  69. {
  70.     spinlock_unlock(&tlblock);
  71.     CPU->tlb_active = 1;
  72. }
  73.  
  74. void tlb_shootdown_ipi_send(void)
  75. {
  76.     ipi_broadcast(VECTOR_TLB_SHOOTDOWN_IPI);
  77. }
  78.  
  79. void tlb_shootdown_ipi_recv(void)
  80. {
  81.     CPU->tlb_active = 0;
  82.     spinlock_lock(&tlblock);
  83.     spinlock_unlock(&tlblock);
  84.     tlb_invalidate(0);  /* TODO: use valid ASID */
  85.     CPU->tlb_active = 1;
  86. }
  87. #endif /* CONFIG_SMP */
  88.