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  1. /*
  2.  * Copyright (c) 2006 Martin Decky
  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 ppc32interrupt
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <ddi/irq.h>
  36. #include <interrupt.h>
  37. #include <arch/interrupt.h>
  38. #include <arch/types.h>
  39. #include <arch.h>
  40. #include <time/clock.h>
  41. #include <ipc/sysipc.h>
  42. #include <arch/drivers/pic.h>
  43. #include <arch/mm/tlb.h>
  44. #include <print.h>
  45.  
  46.  
  47. void start_decrementer(void)
  48. {
  49.     asm volatile (
  50.         "mtdec %0\n"
  51.         :
  52.         : "r" (1000)
  53.     );
  54. }
  55.  
  56.  
  57. /** Handler of external interrupts */
  58. static void exception_external(int n, istate_t *istate)
  59. {
  60.     int inum;
  61.    
  62.     while ((inum = pic_get_pending()) != -1) {
  63.         bool ack = false;
  64.         irq_t *irq = irq_dispatch_and_lock(inum);
  65.         if (irq) {
  66.             /*
  67.              * The IRQ handler was found.
  68.              */
  69.            
  70.             if (irq->preack) {
  71.                 /* Acknowledge the interrupt before processing */
  72.                 pic_ack_interrupt(inum);
  73.                 ack = true;
  74.             }
  75.            
  76.             irq->handler(irq);
  77.             spinlock_unlock(&irq->lock);
  78.         } else {
  79.             /*
  80.              * Spurious interrupt.
  81.              */
  82. #ifdef CONFIG_DEBUG
  83.             printf("cpu%u: spurious interrupt (inum=%d)\n", CPU->id, inum);
  84. #endif
  85.         }
  86.        
  87.         if (!ack)
  88.             pic_ack_interrupt(inum);
  89.     }
  90. }
  91.  
  92.  
  93. static void exception_decrementer(int n, istate_t *istate)
  94. {
  95.     start_decrementer();
  96.     clock();
  97. }
  98.  
  99.  
  100. /* Initialize basic tables for exception dispatching */
  101. void interrupt_init(void)
  102. {
  103.     exc_register(VECTOR_DATA_STORAGE, "data_storage", pht_refill);
  104.     exc_register(VECTOR_INSTRUCTION_STORAGE, "instruction_storage", pht_refill);
  105.     exc_register(VECTOR_EXTERNAL, "external", exception_external);
  106.     exc_register(VECTOR_DECREMENTER, "timer", exception_decrementer);
  107. }
  108.  
  109. /** @}
  110.  */
  111.