device.cc

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/*
 * Copyright (c) 2017-2018 ARM Limited
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 *
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 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2008 The Regents of The University of Michigan
 * All rights reserved.
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 * met: redistributions of source code must retain the above copyright
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#include "dev/ps2/device.hh"
 
#include <algorithm>
 
#include "base/logging.hh"
#include "base/trace.hh"
#include "debug/PS2.hh"
#include "dev/ps2/types.hh"
#include "params/PS2Device.hh"
#include "sim/serialize.hh"
 
namespace gem5
{
 
namespace ps2
{
 
Device::Device(const PS2DeviceParams &p)
    : SimObject(p)
{
    inBuffer.reserve(16);
}
 
void
Device::serialize(CheckpointOut &cp) const
{
    std::vector<uint8_t> buffer(outBuffer.size());
    std::copy(outBuffer.begin(), outBuffer.end(), buffer.begin());
    arrayParamOut(cp, "outBuffer", buffer);
 
    SERIALIZE_CONTAINER(inBuffer);
}
 
void
Device::unserialize(CheckpointIn &cp)
{
    std::vector<uint8_t> buffer;
    arrayParamIn(cp, "outBuffer", buffer);
    for (auto c : buffer)
        outBuffer.push_back(c);
 
    UNSERIALIZE_CONTAINER(inBuffer);
}
 
void
Device::hostRegDataAvailable(const std::function<void()> &c)
{
    fatal_if(dataAvailableCallback,
             "A data pending callback has already been associated with this "
             "PS/2 device.\n");
 
    dataAvailableCallback = c;
}
 
uint8_t
Device::hostRead()
{
    uint8_t data = outBuffer.front();
    outBuffer.pop_front();
    return data;
}
 
void
Device::hostWrite(uint8_t c)
{
    DPRINTF(PS2, "PS2: Host -> device: %#x\n", c);
    inBuffer.push_back(c);
    if (recv(inBuffer))
        inBuffer.clear();
}
 
void
Device::send(const uint8_t *data, size_t size)
{
    assert(data || size == 0);
    while (size) {
        DPRINTF(PS2, "PS2: Device -> host: %#x\n", *data);
        outBuffer.push_back(*(data++));
        size--;
    }
 
    // Registering a callback is optional.
    if (dataAvailableCallback)
        dataAvailableCallback();
}
 
void
Device::sendAck()
{
    send(Ack);
}
 
} // namespace ps2
} // namespace gem5