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  1. /*
  2.  * Copyright (C) 2005 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 <arch/drivers/tick.h>
  30. #include <arch/interrupt.h>
  31. #include <arch/asm.h>
  32. #include <arch/register.h>
  33. #include <debug.h>
  34. #include <time/clock.h>
  35.  
  36. /** Initialize tick interrupt. */
  37. void tick_init(void)
  38. {
  39.     tick_compare_reg_t compare;
  40.    
  41.     interrupt_register(14, "tick_int", tick_interrupt);
  42.     compare.int_dis = false;
  43.     compare.tick_cmpr = TICK_DELTA;
  44.     tick_compare_write(compare.value);
  45.     tick_write(0);
  46. }
  47.  
  48. /** Process tick interrupt.
  49.  *
  50.  * @param n Interrupt Level, 14,  (can be ignored)
  51.  * @param stack Stack pointer of the interrupted context.
  52.  */
  53. void tick_interrupt(int n, void *stack)
  54. {
  55.     softint_reg_t softint, clear;
  56.    
  57.     softint.value = softint_read();
  58.    
  59.     /*
  60.      * Make sure we are servicing interrupt_level_14
  61.      */
  62.     ASSERT(n == 14);
  63.    
  64.     /*
  65.      * Make sure we are servicing TICK_INT.
  66.      */
  67.     ASSERT(softint.tick_int);
  68.  
  69.     /*
  70.      * Clear tick interrupt.
  71.      */
  72.     clear.value = 0;
  73.     clear.tick_int = 1;
  74.     clear_softint_write(clear.value);
  75.    
  76.     /*
  77.      * Restart counter.
  78.      */
  79.     tick_write(0);
  80.    
  81.     clock();
  82. }
  83.