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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.  
  39. static void print_regdump(struct exception_regdump *pstate)
  40. {
  41.     char *pcsymbol = "";
  42.     char *rasymbol = "";
  43.  
  44.     char *s = get_symtab_entry(pstate->epc);
  45.     if (s)
  46.         pcsymbol = s;
  47.     s = get_symtab_entry(pstate->ra);
  48.     if (s)
  49.         rasymbol = s;
  50.    
  51.     printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol,
  52.            pstate->ra,rasymbol);
  53. }
  54.  
  55. pri_t cpu_priority_high(void)
  56. {
  57.     pri_t pri = (pri_t) cp0_status_read();
  58.     cp0_status_write(pri & ~cp0_status_ie_enabled_bit);
  59.     return pri;
  60. }
  61.  
  62. pri_t cpu_priority_low(void)
  63. {
  64.     pri_t pri = (pri_t) cp0_status_read();
  65.     cp0_status_write(pri | cp0_status_ie_enabled_bit);
  66.     return pri;
  67. }
  68.  
  69. void cpu_priority_restore(pri_t pri)
  70. {
  71.     cp0_status_write(cp0_status_read() | (pri & cp0_status_ie_enabled_bit));
  72. }
  73.  
  74. pri_t cpu_priority_read(void)
  75. {
  76.     return cp0_status_read();
  77. }
  78.  
  79. void interrupt(struct exception_regdump *pstate)
  80. {
  81.     __u32 cause;
  82.     int i;
  83.    
  84.     /* decode interrupt number and process the interrupt */
  85.     cause = (cp0_cause_read() >> 8) &0xff;
  86.    
  87.     for (i = 0; i < 8; i++) {
  88.         if (cause & (1 << i)) {
  89.             switch (i) {
  90.                 case 0: /* SW0 - Software interrupt 0 */
  91.                     cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */
  92.                     break;
  93.                 case 1: /* SW1 - Software interrupt 1 */
  94.                     cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */
  95.                     break;
  96.                 case 2: /* IRQ0 */
  97.                 case 3: /* IRQ1 */
  98.                 case 4: /* IRQ2 */
  99.                 case 5: /* IRQ3 */
  100.                 case 6: /* IRQ4 */
  101.                     print_regdump(pstate);
  102.                     panic("unhandled interrupt %d\n", i);
  103.                     break;
  104.                 case TIMER_INTERRUPT:
  105.                     /* clear timer interrupt & set new */
  106.                     cp0_compare_write(cp0_count_read() + cp0_compare_value);
  107.                     clock();
  108.                     break;
  109.             }
  110.         }
  111.     }
  112.  
  113. }
  114.