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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: Ali Saidi
*/
/** @file
* Declaration of a fake device.
*/
#ifndef __ISA_FAKE_HH__
#define __ISA_FAKE_HH__
#include "base/range.hh"
#include "dev/io_device.hh"
#include "dev/alpha/tsunami.hh"
#include "mem/packet.hh"
/**
* IsaFake is a device that returns, BadAddr, 1 or 0 on all reads and
* rites. It is meant to be placed at an address range
* so that an mcheck doesn't occur when an os probes a piece of hw
* that doesn't exist (e.g. UARTs1-3), or catch requests in the memory system
* that have no responders..
*/
class IsaFake : public BasicPioDevice
{
public:
struct Params : public BasicPioDevice::Params
{
Addr pio_size;
bool retBadAddr;
uint8_t retData;
};
protected:
const Params *params() const { return (const Params*)_params; }
uint64_t retData;
public:
/**
* The constructor for Tsunmami Fake just registers itself with the MMU.
* @param p params structure
*/
IsaFake(Params *p);
/**
* This read always returns -1.
* @param pkt The memory request.
* @param data Where to put the data.
*/
virtual Tick read(PacketPtr pkt);
/**
* All writes are simply ignored.
* @param pkt The memory request.
* @param data the data to not write.
*/
virtual Tick write(PacketPtr pkt);
};
#endif // __ISA_FAKE_HH__
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