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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 <arch/interrupt.h>
  30. #include <arch/types.h>
  31. #include <arch.h>
  32. #include <arch/cp0.h>
  33. #include <time/clock.h>
  34. #include <panic.h>
  35. #include <print.h>
  36. #include <symtab.h>
  37. #include <arch/drivers/arc.h>
  38. #include <arch/drivers/keyboard.h>
  39.  
  40. static void print_regdump(struct exception_regdump *pstate)
  41. {
  42.     char *pcsymbol = "";
  43.     char *rasymbol = "";
  44.  
  45.     char *s = get_symtab_entry(pstate->epc);
  46.     if (s)
  47.         pcsymbol = s;
  48.     s = get_symtab_entry(pstate->ra);
  49.     if (s)
  50.         rasymbol = s;
  51.    
  52.     printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol,
  53.            pstate->ra,rasymbol);
  54. }
  55.  
  56. /** Disable interrupts.
  57.  *
  58.  * @return Old interrupt priority level.
  59.  */
  60. ipl_t interrupts_disable(void)
  61. {
  62.     ipl_t ipl = (ipl_t) cp0_status_read();
  63.     cp0_status_write(ipl & ~cp0_status_ie_enabled_bit);
  64.     return ipl;
  65. }
  66.  
  67. /** Enable interrupts.
  68.  *
  69.  * @return Old interrupt priority level.
  70.  */
  71. ipl_t interrupts_enable(void)
  72. {
  73.     ipl_t ipl = (ipl_t) cp0_status_read();
  74.     cp0_status_write(ipl | cp0_status_ie_enabled_bit);
  75.     return ipl;
  76. }
  77.  
  78. /** Restore interrupt priority level.
  79.  *
  80.  * @param ipl Saved interrupt priority level.
  81.  */
  82. void interrupts_restore(ipl_t ipl)
  83. {
  84.     cp0_status_write(cp0_status_read() | (ipl & cp0_status_ie_enabled_bit));
  85. }
  86.  
  87. /** Read interrupt priority level.
  88.  *
  89.  * @return Current interrupt priority level.
  90.  */
  91. ipl_t interrupts_read(void)
  92. {
  93.     return cp0_status_read();
  94. }
  95.  
  96. void interrupt(struct exception_regdump *pstate)
  97. {
  98.     __u32 cause;
  99.     int i;
  100.    
  101.     /* decode interrupt number and process the interrupt */
  102.     cause = (cp0_cause_read() >> 8) &0xff;
  103.    
  104.     for (i = 0; i < 8; i++) {
  105.         if (cause & (1 << i)) {
  106.             switch (i) {
  107.                 case 0: /* SW0 - Software interrupt 0 */
  108.                     cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */
  109.                     break;
  110.                 case 1: /* SW1 - Software interrupt 1 */
  111.                     cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */
  112.                     break;
  113.                 case 2: /* IRQ0 */
  114.                 case KEYBOARD_IRQ:
  115.                     keyboard();
  116.                     break;
  117.                 case 4: /* IRQ2 */
  118.                 case 5: /* IRQ3 */
  119.                 case 6: /* IRQ4 */
  120.                 default:
  121.                     print_regdump(pstate);
  122.                     panic("unhandled interrupt %d\n", i);
  123.                     break;
  124.                 case TIMER_IRQ:
  125.                     /* clear timer interrupt & set new */
  126.                     cp0_compare_write(cp0_count_read() + cp0_compare_value);
  127.                     clock();
  128.                     break;
  129.             }
  130.         }
  131.     }
  132.  
  133. }
  134.