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  1. /*
  2.  * Copyright (C) 2003-2004 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 <interrupt.h>
  30. #include <arch/interrupt.h>
  31. #include <arch/types.h>
  32. #include <arch.h>
  33. #include <arch/cp0.h>
  34. #include <time/clock.h>
  35. #include <arch/drivers/arc.h>
  36.  
  37. /** Disable interrupts.
  38.  *
  39.  * @return Old interrupt priority level.
  40.  */
  41. ipl_t interrupts_disable(void)
  42. {
  43.     ipl_t ipl = (ipl_t) cp0_status_read();
  44.     cp0_status_write(ipl & ~cp0_status_ie_enabled_bit);
  45.     return ipl;
  46. }
  47.  
  48. /** Enable interrupts.
  49.  *
  50.  * @return Old interrupt priority level.
  51.  */
  52. ipl_t interrupts_enable(void)
  53. {
  54.     ipl_t ipl = (ipl_t) cp0_status_read();
  55.     cp0_status_write(ipl | cp0_status_ie_enabled_bit);
  56.     return ipl;
  57. }
  58.  
  59. /** Restore interrupt priority level.
  60.  *
  61.  * @param ipl Saved interrupt priority level.
  62.  */
  63. void interrupts_restore(ipl_t ipl)
  64. {
  65.     cp0_status_write(cp0_status_read() | (ipl & cp0_status_ie_enabled_bit));
  66. }
  67.  
  68. /** Read interrupt priority level.
  69.  *
  70.  * @return Current interrupt priority level.
  71.  */
  72. ipl_t interrupts_read(void)
  73. {
  74.     return cp0_status_read();
  75. }
  76.  
  77. static void timer_exception(int n, void *stack)
  78. {
  79.     cp0_compare_write(cp0_count_read() + cp0_compare_value);
  80.     clock();
  81. }
  82.  
  83. static void swint0(int n, void *stack)
  84. {
  85.     cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */
  86. }
  87.  
  88. static void swint1(int n, void *stack)
  89. {
  90.     cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */
  91. }
  92.  
  93. /* Initialize basic tables for exception dispatching */
  94. void interrupt_init(void)
  95. {
  96.     int i;
  97.  
  98.     int_register(TIMER_IRQ, "timer", timer_exception);
  99.     int_register(0, "swint0", swint0);
  100.     int_register(1, "swint1", swint1);
  101. }
  102.