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/*
* Copyright (c) 2007 MIPS Technologies, Inc.
* 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: Rick Strong
*/
#ifndef __ARCH_MIPS_INTERRUPT_HH__
#define __ARCH_MIPS_INTERRUPT_HH__
#include <string>
#include "arch/mips/faults.hh"
#include "base/compiler.hh"
#include "base/misc.hh"
#include "params/MipsInterrupts.hh"
#include "sim/serialize.hh"
#include "sim/sim_object.hh"
class BaseCPU;
class Checkpoint;
namespace MipsISA
{
class Interrupts : public SimObject
{
public:
typedef MipsInterruptsParams Params;
const Params *
params() const
{
return dynamic_cast<const Params *>(_params);
}
Interrupts(Params * p) : SimObject(p)
{
}
void
setCPU(BaseCPU *_cpu)
{}
// post(int int_num, int index) is responsible
// for posting an interrupt. It sets a bit
// in intstatus corresponding to Cause IP*. The
// MIPS register Cause is updated by updateIntrInfo
// which is called by checkInterrupts
//
void post(int int_num, ThreadContext *tc);
void post(int int_num, int index);
// clear(int int_num, int index) is responsible
// for clearing an interrupt. It clear a bit
// in intstatus corresponding to Cause IP*. The
// MIPS register Cause is updated by updateIntrInfo
// which is called by checkInterrupts
//
void clear(int int_num, ThreadContext* tc);
void clear(int int_num, int index);
// clearAll() is responsible
// for clearing all interrupts. It clears all bits
// in intstatus corresponding to Cause IP*. The
// MIPS register Cause is updated by updateIntrInfo
// which is called by checkInterrupts
//
void clearAll(ThreadContext *tc);
void clearAll();
// getInterrupt(ThreadContext * tc) checks if an interrupt
// should be returned. It ands the interrupt mask and
// and interrupt pending bits to see if one exists. It
// also makes sure interrupts are enabled (IE) and
// that ERL and ERX are not set
//
Fault getInterrupt(ThreadContext *tc);
// updateIntrInfo(ThreadContext *tc) const syncs the
// MIPS cause register with the instatus variable. instatus
// is essentially a copy of the MIPS cause[IP7:IP0]
//
void updateIntrInfo(ThreadContext *tc) const;
bool interruptsPending(ThreadContext *tc) const;
bool onCpuTimerInterrupt(ThreadContext *tc) const;
bool
checkInterrupts(ThreadContext *tc) const
{
return interruptsPending(tc);
}
void
serialize(CheckpointOut &cp) const M5_ATTR_OVERRIDE
{
fatal("Serialization of Interrupts Unimplemented for MIPS");
}
void
unserialize(CheckpointIn &cp) M5_ATTR_OVERRIDE
{
fatal("Unserialization of Interrupts Unimplemented for MIPS");
}
};
}
#endif
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