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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. #include <panic.h>
  39.  
  40. SPINLOCK_INITIALIZE(tlblock);
  41.  
  42. void tlb_init(void)
  43. {
  44.     tlb_arch_init();
  45. }
  46.  
  47. #ifdef CONFIG_SMP
  48. /* must be called with interrupts disabled */
  49. void tlb_shootdown_start(tlb_invalidate_type_t type, asid_t asid, __address page, count_t cnt)
  50. {
  51.     int i;
  52.  
  53.     CPU->tlb_active = 0;
  54.     spinlock_lock(&tlblock);
  55.    
  56.     /*
  57.      * TODO: assemble shootdown message.
  58.      */
  59.     tlb_shootdown_ipi_send();
  60.  
  61.     switch (type) {
  62.         case TLB_INVL_ALL:
  63.         tlb_invalidate_all();
  64.         break;
  65.         case TLB_INVL_ASID:
  66.         tlb_invalidate_asid(asid);
  67.         break;
  68.         case TLB_INVL_PAGES:
  69.         tlb_invalidate_pages(asid, page, cnt);
  70.         break;
  71.         default:
  72.         panic("unknown tlb_invalidate_type_t value: %d\n", type);
  73.         break;
  74.     }
  75.    
  76. busy_wait: 
  77.     for (i = 0; i<config.cpu_count; i++)
  78.         if (cpus[i].tlb_active)
  79.             goto busy_wait;
  80. }
  81.  
  82. void tlb_shootdown_finalize(void)
  83. {
  84.     spinlock_unlock(&tlblock);
  85.     CPU->tlb_active = 1;
  86. }
  87.  
  88. void tlb_shootdown_ipi_send(void)
  89. {
  90.     ipi_broadcast(VECTOR_TLB_SHOOTDOWN_IPI);
  91. }
  92.  
  93. void tlb_shootdown_ipi_recv(void)
  94. {
  95.     CPU->tlb_active = 0;
  96.     spinlock_lock(&tlblock);
  97.     spinlock_unlock(&tlblock);
  98.     tlb_invalidate_all();   /* TODO: use valid ASID */
  99.     CPU->tlb_active = 1;
  100. }
  101. #endif /* CONFIG_SMP */
  102.