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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. /** Disable interrupts.
  56.  *
  57.  * @return Old interrupt priority level.
  58.  */
  59. ipl_t interrupts_disable(void)
  60. {
  61.     ipl_t ipl = (ipl_t) cp0_status_read();
  62.     cp0_status_write(ipl & ~cp0_status_ie_enabled_bit);
  63.     return ipl;
  64. }
  65.  
  66. /** Enable interrupts.
  67.  *
  68.  * @return Old interrupt priority level.
  69.  */
  70. ipl_t interrupts_enable(void)
  71. {
  72.     ipl_t ipl = (ipl_t) cp0_status_read();
  73.     cp0_status_write(ipl | cp0_status_ie_enabled_bit);
  74.     return ipl;
  75. }
  76.  
  77. /** Restore interrupt priority level.
  78.  *
  79.  * @param ipl Saved interrupt priority level.
  80.  */
  81. void interrupts_restore(ipl_t ipl)
  82. {
  83.     cp0_status_write(cp0_status_read() | (ipl & cp0_status_ie_enabled_bit));
  84. }
  85.  
  86. /** Read interrupt priority level.
  87.  *
  88.  * @return Current interrupt priority level.
  89.  */
  90. ipl_t interrupts_read(void)
  91. {
  92.     return cp0_status_read();
  93. }
  94.  
  95. void interrupt(struct exception_regdump *pstate)
  96. {
  97.     __u32 cause;
  98.     int i;
  99.    
  100.     /* decode interrupt number and process the interrupt */
  101.     cause = (cp0_cause_read() >> 8) &0xff;
  102.    
  103.     for (i = 0; i < 8; i++) {
  104.         if (cause & (1 << i)) {
  105.             switch (i) {
  106.                 case 0: /* SW0 - Software interrupt 0 */
  107.                     cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */
  108.                     break;
  109.                 case 1: /* SW1 - Software interrupt 1 */
  110.                     cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */
  111.                     break;
  112.                 case 2: /* IRQ0 */
  113.                 case 3: /* IRQ1 */
  114.                 case 4: /* IRQ2 */
  115.                 case 5: /* IRQ3 */
  116.                 case 6: /* IRQ4 */
  117.                 default:
  118.                     print_regdump(pstate);
  119.                     panic("unhandled interrupt %d\n", i);
  120.                     break;
  121.                 case TIMER_INTERRUPT:
  122.                     /* clear timer interrupt & set new */
  123.                     cp0_compare_write(cp0_count_read() + cp0_compare_value);
  124.                     clock();
  125.                     break;
  126.             }
  127.         }
  128.     }
  129.  
  130. }
  131.