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/* This file is part of test microkernel for OpenRISC 1000. */

/* (C) 2001 Simon Srot, srot@opencores.org */

#include "common.h"

#include "support.h"

#include "spr-defs.h"

#include "int.h"

#ifdef OR1K

/* Interrupt handlers table */

struct ihnd int_handlers[MAX_INT_HANDLERS];

/* Initialize routine */

int int_init()

{

  int i;

  for(i = 0; i < MAX_INT_HANDLERS; i++) {

    int_handlers[i].handler = 0;

  }

  return 0;

}

/* Add interrupt handler */

int int_add(unsigned long vect, void (* handler)(void))

{

  if(vect >= MAX_INT_HANDLERS) return -1;

  int_handlers[vect].handler = handler;

  debug ("int_add %i: %08lx\n", vect, int_handlers[vect].handler);

  mtspr(SPR_PICMR, mfspr(SPR_PICMR) | (0x00000001L << vect));

  return 0;

}

/* Disable interrupt */

int int_disable(unsigned long vect)

{

  if(vect >= MAX_INT_HANDLERS) return -1;

  mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(0x00000001L << vect));

  return 0;

}

/* Enable interrupt */

int int_enable(unsigned long vect)

{

  if(vect >= MAX_INT_HANDLERS) return -1;

  mtspr(SPR_PICMR, mfspr(SPR_PICMR) | (0x00000001L << vect));

  return 0;

}

/* Main interrupt handler */

void int_main(void)

{

  unsigned long picsr = mfspr(SPR_PICSR);

  unsigned long i = 0;

  mtspr(SPR_PICSR, 0);

  //printf ("int :%08lx\n", picsr);

  while(i < 32) {

    if((picsr & (0x01L << i)) && (int_handlers[i].handler != 0)) {

      (*int_handlers[i].handler)();

      mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(0x00000001L << i));

    }

    i++;

  }

}

void

int_error(int vect)

{

  printf("\n\nERROR - ");

  switch(vect)

    {

    case 2:

      printf("BUS ERROR (0x200)\n");

      break;

    case 6:

      printf("ALIGN ERROR (0x600)\n");

      break;

    case 7:

      printf("ILLEGAL INSN ERROR (0x700)\n");

      break;

    default:

      printf("UNKNOWN ERROR (%d)\n",vect);

      break;

    }

  printf("\n");

  // TODO - print some more diagnostics here

  printf("Attemping to reset...\n\n");

  asm volatile("l.ori r3, r0, 0x100");

  asm volatile("l.jr r3");

  asm volatile("l.nop");

  // Stay here forever. 

  //while(1);

}

#endif