xref: /gem5/src/arch/sparc/interrupts.hh

/*
 * Copyright (c) 2006 The Regents of The University of Michigan
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Authors: Gabe Black
 */

#ifndef __ARCH_SPARC_INTERRUPT_HH__
#define __ARCH_SPARC_INTERRUPT_HH__

#include "arch/sparc/faults.hh"
#include "cpu/thread_context.hh"


namespace SparcISA
{
    class Interrupts
    {
      protected:


      public:
        Interrupts()
        {

        }
        void post(int int_num, int index)
        {

        }

        void clear(int int_num, int index)
        {

        }

        void clear_all()
        {

        }

        bool check_interrupts(ThreadContext * tc) const
        {
            // so far only handle softint interrupts
            int int_level = InterruptLevel(tc->readMiscReg(MISCREG_SOFTINT));
            if (int_level)
                return true;
            else
                return false;
        }

        Fault getInterrupt(ThreadContext * tc)
        {
            // conditioning the softint interrups
            if (tc->readMiscReg(MISCREG_HPSTATE) & hpriv) {
                // if running in privileged mode, then pend the interrupt
                return NoFault;
            } else {
                int int_level = InterruptLevel(tc->readMiscReg(MISCREG_SOFTINT));
                if ((int_level <= tc->readMiscReg(MISCREG_PIL)) ||
                    !(tc->readMiscReg(MISCREG_PSTATE) & ie)) {
                    // if PIL or no interrupt enabled, then pend the interrupt
                    return NoFault;
                } else {
                    return new InterruptLevelN(int_level);
                }
            }
        }

        void updateIntrInfo(ThreadContext * tc)
        {

        }

        void serialize(std::ostream &os)
        {
        }

        void unserialize(Checkpoint *cp, const std::string &section)
        {
        }
    };
}

#endif // __ARCH_SPARC_INTERRUPT_HH__