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/*
* Copyright (c) 2014 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* 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.
*
* 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: Andreas Sandberg
*/
#ifndef __DEV_VIRTIO_CONSOLE_HH__
#define __DEV_VIRTIO_CONSOLE_HH__
#include "dev/serial/serial.hh"
#include "dev/virtio/base.hh"
struct VirtIOConsoleParams;
/**
* VirtIO console
*
* The VirtIO console uses the following queues:
* -# Port0 receive (from host to guest)
* -# Port0 transmit (from guest to host)
* -# Control receive (optional)
* -# Control transmit (optional)
* -# Port1 receive (optional)
* -# Port1 transmit (optional)
*
* This implementation implements the minimum of features for one
* port, which means that the multiport feature is not announced and
* only queue 0 and 1 are available.
*
* @see https://github.com/rustyrussell/virtio-spec
* @see http://docs.oasis-open.org/virtio/virtio/v1.0/virtio-v1.0.html
*/
class VirtIOConsole : public VirtIODeviceBase
{
public:
typedef VirtIOConsoleParams Params;
VirtIOConsole(Params *params);
virtual ~VirtIOConsole();
void readConfig(PacketPtr pkt, Addr cfgOffset);
protected:
/**
* Console configuration structure
*
* @note This needs to be changed if the multiport feature is
* announced!
*/
struct Config {
uint16_t cols;
uint16_t rows;
} M5_ATTR_PACKED;
/** Currently active configuration (host byte order) */
Config config;
/** VirtIO device ID */
static const DeviceId ID_CONSOLE = 0x03;
/** @{
* @name Feature bits
*/
/** Provides the size information */
static const FeatureBits F_SIZE = 0x01;
/** Supports the multi-port interface */
static const FeatureBits F_MULTIPORT = 0x02;
/** @} */
protected:
/**
* Virtqueue for data going from the host to the guest.
*/
class TermRecvQueue
: public VirtQueue
{
public:
TermRecvQueue(PortProxy &proxy, uint16_t size, VirtIOConsole &_parent)
: VirtQueue(proxy, size), parent(_parent) {}
virtual ~TermRecvQueue() {}
void onNotify() { trySend(); }
/** Try to send data pending data from the terminal. */
void trySend();
std::string name() const { return parent.name() + ".qRecv"; }
protected:
VirtIOConsole &parent;
};
/** Receive queue for port 0 */
TermRecvQueue qRecv;
/**
* Virtqueue for data going from the guest to the host.
*/
class TermTransQueue
: public VirtQueue
{
public:
TermTransQueue(PortProxy &proxy, uint16_t size, VirtIOConsole &_parent)
: VirtQueue(proxy, size), parent(_parent) {}
virtual ~TermTransQueue() {}
void onNotifyDescriptor(VirtDescriptor *desc);
std::string name() const { return parent.name() + ".qTrans"; }
protected:
VirtIOConsole &parent;
};
/** Transmit queue for port 0 */
TermTransQueue qTrans;
protected:
SerialDevice &device;
MakeCallback<VirtIOConsole::TermRecvQueue,
&VirtIOConsole::TermRecvQueue::trySend> callbackDataAvail;
};
#endif // __DEV_VIRTIO_CONSOLE_HH__
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