serial.cc

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/*
 * Copyright (c) 2014, 2017 ARM Limited
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 *
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 * this software without specific prior written permission.
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * Authors: Andreas Sandberg
 */

#include "dev/serial/serial.hh"

#include "base/logging.hh"
#include "params/SerialDevice.hh"
#include "params/SerialNullDevice.hh"

SerialDevice::SerialDevice(const SerialDeviceParams *p)
    : SimObject(p), interfaceCallback(nullptr)
{
}

SerialDevice::~SerialDevice()
{
}

void
SerialDevice::regInterfaceCallback(Callback *c)
{
    // This can happen if the user has connected multiple UARTs to the
    // same terminal. In that case, each of them tries to register
    // callbacks.
    if (interfaceCallback)
        fatal("A UART has already been associated with this device.\n");
    interfaceCallback = c;
}

void
SerialDevice::notifyInterface()
{
    assert(dataAvailable());
    // Registering a callback is optional.
    if (interfaceCallback)
        interfaceCallback->process();
}




SerialNullDevice::SerialNullDevice(const SerialNullDeviceParams *p)
    : SerialDevice(p)
{
}

uint8_t
SerialNullDevice::readData()
{
    panic("SerialNullDevice does not have pending data.\n");
}



SerialNullDevice *
SerialNullDeviceParams::create()
{
    return new SerialNullDevice(this);
}