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/*
* Copyright (c) 2008 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.
*/
#ifndef __DEV_X86_I8237_HH__
#define __DEV_X86_I8237_HH__
#include <array>
#include "dev/io_device.hh"
#include "dev/reg_bank.hh"
#include "params/I8237.hh"
namespace gem5
{
namespace X86ISA
{
class I8237 : public BasicPioDevice
{
public:
using Register = RegisterBankLE::Register8;
protected:
Tick latency;
uint8_t maskVal;
//XXX These should be serialized.
uint8_t requestVal;
uint8_t commandVal;
uint8_t statusVal;
uint8_t tempVal;
bool highByte;
RegisterBankLE regs;
struct Channel
{
class ChannelAddrReg : public Register
{
public:
ChannelAddrReg(Channel &);
};
class ChannelRemainingReg : public Register
{
public:
ChannelRemainingReg(Channel &);
};
int number;
//XXX These should be serialized.
uint8_t mode = 0x0;
ChannelAddrReg addrReg;
ChannelRemainingReg remainingReg;
Channel(int _num) : number(_num), addrReg(*this), remainingReg(*this)
{}
};
class WriteOnlyReg : public Register
{
public:
WriteOnlyReg(const std::string &new_name, Addr offset);
};
std::array<Channel, 4> channels;
Register statusCommandReg;
WriteOnlyReg requestReg;
WriteOnlyReg setMaskBitReg;
WriteOnlyReg modeReg;
WriteOnlyReg clearFlipFlopReg;
Register temporaryMasterClearReg;
WriteOnlyReg clearMaskReg;
WriteOnlyReg writeMaskReg;
void reset();
void setMaskBit(Register &reg, const uint8_t &command);
void setRequestBit(Register &reg, const uint8_t &command);
public:
using Params = I8237Params;
I8237(const Params &p);
Tick read(PacketPtr pkt) override;
Tick write(PacketPtr pkt) override;
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
};
} // namespace X86ISA
} // namespace gem5
#endif //__DEV_X86_I8237_HH__