860155a5fc
This patch adds a check to ensure that the delay incurred by the bus is not simply disregarded, but accounted for by someone. At this point, all the modules do is to zero it out, and no additional time is spent. This highlights where the bus timing is simply dropped instead of being paid for. As a follow up, the locations identified in this patch should add this additional time to the packets in one way or another. For now it simply acts as a sanity check and highlights where the delay is simply ignored. Since no time is added, all regressions remain the same.
120 lines
3.8 KiB
C++
120 lines
3.8 KiB
C++
/*
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* Copyright (c) 2012 ARM Limited
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* All rights reserved.
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Copyright (c) 2006 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Ali Saidi
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* Nathan Binkert
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*/
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#include "base/trace.hh"
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#include "debug/BusAddrRanges.hh"
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#include "dev/io_device.hh"
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#include "sim/system.hh"
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PioPort::PioPort(PioDevice *dev)
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: SimpleTimingPort(dev->name() + ".pio", dev), device(dev)
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{
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}
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Tick
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PioPort::recvAtomic(PacketPtr pkt)
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{
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// @todo: We need to pay for this and not just zero it out
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pkt->busFirstWordDelay = pkt->busLastWordDelay = 0;
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return pkt->isRead() ? device->read(pkt) : device->write(pkt);
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}
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AddrRangeList
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PioPort::getAddrRanges() const
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{
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return device->getAddrRanges();
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}
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PioDevice::PioDevice(const Params *p)
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: MemObject(p), sys(p->system), pioPort(this)
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{}
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PioDevice::~PioDevice()
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{
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}
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void
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PioDevice::init()
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{
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if (!pioPort.isConnected())
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panic("Pio port of %s not connected to anything!", name());
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pioPort.sendRangeChange();
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}
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BaseSlavePort &
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PioDevice::getSlavePort(const std::string &if_name, PortID idx)
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{
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if (if_name == "pio") {
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return pioPort;
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}
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return MemObject::getSlavePort(if_name, idx);
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}
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unsigned int
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PioDevice::drain(DrainManager *dm)
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{
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unsigned int count;
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count = pioPort.drain(dm);
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if (count)
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setDrainState(Drainable::Draining);
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else
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setDrainState(Drainable::Drained);
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return count;
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}
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BasicPioDevice::BasicPioDevice(const Params *p)
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: PioDevice(p), pioAddr(p->pio_addr), pioSize(0),
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pioDelay(p->pio_latency)
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{}
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AddrRangeList
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BasicPioDevice::getAddrRanges() const
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{
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assert(pioSize != 0);
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AddrRangeList ranges;
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DPRINTF(BusAddrRanges, "registering range: %#x-%#x\n", pioAddr, pioSize);
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ranges.push_back(RangeSize(pioAddr, pioSize));
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return ranges;
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}
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