gem5/src/dev/uart.hh
Andreas Sandberg 0c5139310d dev: Refactor terminal<->UART interface to make it more generic
The terminal currently assumes that the transport to the guest always
inherits from the Uart class. This assumption breaks when
implementing, for example, a VirtIO consoles. This patch removes this
assumption by adding pointer to the from the terminal to the uart and
replacing it with a more general callback interface. The Uart, or any
other class using the terminal, class implements an instance of the
callbacks class and registers it with the terminal.
2014-09-20 17:17:50 -04:00

79 lines
2.4 KiB
C++

/*
* 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
* Base class for UART
*/
#ifndef __UART_HH__
#define __UART_HH__
#include "dev/io_device.hh"
#include "dev/terminal.hh"
#include "params/Uart.hh"
class Platform;
const int RX_INT = 0x1;
const int TX_INT = 0x2;
class Uart : public BasicPioDevice
{
protected:
int status;
Platform *platform;
Terminal *term;
public:
typedef UartParams Params;
Uart(const Params *p, Addr pio_size);
const Params *
params() const
{
return dynamic_cast<const Params *>(_params);
}
/**
* Inform the uart that there is data available.
*/
virtual void dataAvailable() = 0;
/**
* Return if we have an interrupt pending
* @return interrupt status
*/
bool intStatus() { return status ? true : false; }
protected:
MakeCallback<Uart, &Uart::dataAvailable> callbackDataAvail;
};
#endif // __UART_HH__