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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.  /** @addtogroup sparc64   
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #include <arch/drivers/tick.h>
  36. #include <arch/interrupt.h>
  37. #include <arch/asm.h>
  38. #include <arch/register.h>
  39. #include <debug.h>
  40. #include <time/clock.h>
  41. #include <typedefs.h>
  42.  
  43. /** Initialize tick interrupt. */
  44. void tick_init(void)
  45. {
  46.     tick_compare_reg_t compare;
  47.    
  48.     interrupt_register(14, "tick_int", tick_interrupt);
  49.     compare.int_dis = false;
  50.     compare.tick_cmpr = TICK_DELTA;
  51.     tick_compare_write(compare.value);
  52.     tick_write(0);
  53. }
  54.  
  55. /** Process tick interrupt.
  56.  *
  57.  * @param n Interrupt Level, 14,  (can be ignored)
  58.  * @param istate Interrupted state.
  59.  */
  60. void tick_interrupt(int n, istate_t *istate)
  61. {
  62.     softint_reg_t softint, clear;
  63.    
  64.     softint.value = softint_read();
  65.    
  66.     /*
  67.      * Make sure we are servicing interrupt_level_14
  68.      */
  69.     ASSERT(n == 14);
  70.    
  71.     /*
  72.      * Make sure we are servicing TICK_INT.
  73.      */
  74.     ASSERT(softint.tick_int);
  75.  
  76.     /*
  77.      * Clear tick interrupt.
  78.      */
  79.     clear.value = 0;
  80.     clear.tick_int = 1;
  81.     clear_softint_write(clear.value);
  82.    
  83.     /*
  84.      * Restart counter.
  85.      */
  86.     tick_write(0);
  87.    
  88.     clock();
  89. }
  90.  
  91.  /** @}
  92.  */
  93.  
  94.