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/* int.c -- Interrupt handling for Or1ksim tests.

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

   Copyright (C) 2008, 2010 Embecosm Limited

   Contributor Simon Srot <srot@opencores.org>

   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

   This file is part of OpenRISC 1000 Architectural Simulator.

   This program is free software; you can redistribute it and/or modify it

   under the terms of the GNU General Public License as published by the Free

   Software Foundation; either version 3 of the License, or (at your option)

   any later version.

   This program is distributed in the hope that it will be useful, but WITHOUT

   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

   more details.

   You should have received a copy of the GNU General Public License along

   with this program.  If not, see <http://www.gnu.org/licenses/>. */

/* ----------------------------------------------------------------------------

   This code is commented throughout for use with Doxygen.

   --------------------------------------------------------------------------*/

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

#include "support.h"

#include "spr-defs.h"

#include "int.h"

/* 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;

    int_handlers[i].arg = 0;

  }

  return 0;

}

/* Add interrupt handler */

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

{

  if(vect >= MAX_INT_HANDLERS)

    return -1;

  int_handlers[vect].handler = handler;

  int_handlers[vect].arg = arg;

  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()

{

  unsigned long picsr = mfspr(SPR_PICSR);

  unsigned long i = 0;

  mtspr(SPR_PICSR, 0);

  while(i < 32) {

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

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

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

    }

    i++;

  }

}