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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 <panic.h>
  36. #include <print.h>
  37. #include <symtab.h>
  38. #include <arch/drivers/arc.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. static void unhandled_exception(int n, void *stack)
  97. {
  98.     struct exception_regdump *pstate = (struct exception_regdump *)stack;
  99.  
  100.     print_regdump(pstate);
  101.     panic("unhandled interrupt %d\n", n);
  102. }
  103.  
  104. static void timer_exception(int n, void *stack)
  105. {
  106.     cp0_compare_write(cp0_count_read() + cp0_compare_value);
  107.     clock();
  108. }
  109.  
  110. static void swint0(int n, void *stack)
  111. {
  112.     cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */
  113. }
  114.  
  115. static void swint1(int n, void *stack)
  116. {
  117.     cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */
  118. }
  119.  
  120. /** Basic exception handler */
  121. void interrupt(struct exception_regdump *pstate)
  122. {
  123.     __u32 cause;
  124.     int i;
  125.    
  126.     /* decode interrupt number and process the interrupt */
  127.     cause = (cp0_cause_read() >> 8) &0xff;
  128.    
  129.     for (i = 0; i < 8; i++)
  130.         if (cause & (1 << i))
  131.             exc_dispatch(i, (void *)pstate);
  132. }
  133.  
  134. /* Initialize basic tables for exception dispatching */
  135. void interrupt_init(void)
  136. {
  137.     int i;
  138.  
  139.     for (i=0;i < IVT_ITEMS; i++)
  140.         exc_register(i, "undef", unhandled_exception);
  141.  
  142.     exc_register(TIMER_IRQ, "timer", timer_exception);
  143.     exc_register(0, "swint0", swint0);
  144.     exc_register(1, "swint1", swint1);
  145. }
  146.