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/*
* Copyright (c) 2004-2005 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 __DEV_X86_I8259_HH__
#define __DEV_X86_I8259_HH__
#include "dev/x86/intdev.hh"
#include "dev/io_device.hh"
#include "enums/X86I8259CascadeMode.hh"
#include "params/I8259.hh"
namespace X86ISA
{
class I8259 : public BasicPioDevice, public IntDevice
{
protected:
static const int NumLines = 8;
bool pinStates[NumLines];
Tick latency;
IntSourcePin *output;
Enums::X86I8259CascadeMode mode;
I8259 * slave;
// Interrupt Request Register
uint8_t IRR;
// In Service Register
uint8_t ISR;
// Interrupt Mask Register
uint8_t IMR;
// The higher order bits of the vector to return
uint8_t vectorOffset;
bool cascadeMode;
// A bit vector of lines with slaves attached, or the slave id, depending
// on if this is a master or slave PIC.
uint8_t cascadeBits;
bool edgeTriggered;
bool readIRR;
// State machine information for reading in initialization control words.
bool expectICW4;
int initControlWord;
// Whether or not the PIC is in auto EOI mode.
bool autoEOI;
void requestInterrupt(int line);
void handleEOI(int line);
public:
typedef I8259Params Params;
const Params *
params() const
{
return dynamic_cast<const Params *>(_params);
}
I8259(Params * p);
Tick read(PacketPtr pkt) override;
Tick write(PacketPtr pkt) override;
void
maskAll()
{
IMR = 0xFF;
}
void
unmaskAll()
{
IMR = 0x00;
}
void signalInterrupt(int line) override;
void raiseInterruptPin(int number) override;
void lowerInterruptPin(int number) override;
int getVector();
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
};
} // namespace X86ISA
#endif //__DEV_X86_I8259_HH__
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