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/*
* Copyright (c) 2006 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
* Steve Reinhardt
*/
/**
* @file
* Definition of the Packet Class, a packet is a transaction occuring
* between a single level of the memory heirarchy (ie L1->L2).
*/
#include <iostream>
#include <cstring>
#include "base/misc.hh"
#include "base/trace.hh"
#include "mem/packet.hh"
static const std::string ReadReqString("ReadReq");
static const std::string WriteReqString("WriteReq");
static const std::string WriteReqNoAckString("WriteReqNoAck|Writeback");
static const std::string ReadRespString("ReadResp");
static const std::string WriteRespString("WriteResp");
static const std::string SoftPFReqString("SoftPFReq");
static const std::string SoftPFRespString("SoftPFResp");
static const std::string HardPFReqString("HardPFReq");
static const std::string HardPFRespString("HardPFResp");
static const std::string InvalidateReqString("InvalidateReq");
static const std::string WriteInvalidateReqString("WriteInvalidateReq");
static const std::string WriteInvalidateRespString("WriteInvalidateResp");
static const std::string UpgradeReqString("UpgradeReq");
static const std::string ReadExReqString("ReadExReq");
static const std::string ReadExRespString("ReadExResp");
static const std::string OtherCmdString("<other>");
const std::string &
Packet::cmdString() const
{
switch (cmd) {
case ReadReq: return ReadReqString;
case WriteReq: return WriteReqString;
case WriteReqNoAck: return WriteReqNoAckString;
case ReadResp: return ReadRespString;
case WriteResp: return WriteRespString;
case SoftPFReq: return SoftPFReqString;
case SoftPFResp: return SoftPFRespString;
case HardPFReq: return HardPFReqString;
case HardPFResp: return HardPFRespString;
case InvalidateReq: return InvalidateReqString;
case WriteInvalidateReq:return WriteInvalidateReqString;
case WriteInvalidateResp:return WriteInvalidateRespString;
case UpgradeReq: return UpgradeReqString;
case ReadExReq: return ReadExReqString;
case ReadExResp: return ReadExRespString;
default: return OtherCmdString;
}
}
const std::string &
Packet::cmdIdxToString(Packet::Command idx)
{
switch (idx) {
case ReadReq: return ReadReqString;
case WriteReq: return WriteReqString;
case WriteReqNoAck: return WriteReqNoAckString;
case ReadResp: return ReadRespString;
case WriteResp: return WriteRespString;
case SoftPFReq: return SoftPFReqString;
case SoftPFResp: return SoftPFRespString;
case HardPFReq: return HardPFReqString;
case HardPFResp: return HardPFRespString;
case InvalidateReq: return InvalidateReqString;
case WriteInvalidateReq:return WriteInvalidateReqString;
case WriteInvalidateResp:return WriteInvalidateRespString;
case UpgradeReq: return UpgradeReqString;
case ReadExReq: return ReadExReqString;
case ReadExResp: return ReadExRespString;
default: return OtherCmdString;
}
}
/** delete the data pointed to in the data pointer. Ok to call to matter how
* data was allocted. */
void
Packet::deleteData()
{
assert(staticData || dynamicData);
if (staticData)
return;
if (arrayData)
delete [] data;
else
delete data;
}
/** If there isn't data in the packet, allocate some. */
void
Packet::allocate()
{
if (data)
return;
assert(!staticData);
dynamicData = true;
arrayData = true;
data = new uint8_t[getSize()];
}
/** Do the packet modify the same addresses. */
bool
Packet::intersect(PacketPtr p)
{
Addr s1 = getAddr();
Addr e1 = getAddr() + getSize() - 1;
Addr s2 = p->getAddr();
Addr e2 = p->getAddr() + p->getSize() - 1;
return !(s1 > e2 || e1 < s2);
}
bool
fixDelayedResponsePacket(PacketPtr func, PacketPtr timing)
{
bool result;
if (timing->isRead() || timing->isWrite()) {
timing->toggleData();
result = fixPacket(func, timing);
timing->toggleData();
}
else {
//Don't toggle if it isn't a read/write response
result = fixPacket(func, timing);
}
return result;
}
bool
fixPacket(PacketPtr func, PacketPtr timing)
{
Addr funcStart = func->getAddr();
Addr funcEnd = func->getAddr() + func->getSize() - 1;
Addr timingStart = timing->getAddr();
Addr timingEnd = timing->getAddr() + timing->getSize() - 1;
assert(!(funcStart > timingEnd || timingStart > funcEnd));
// this packet can't solve our problem, continue on
if (!timing->hasData())
return true;
if (func->isRead()) {
if (funcStart >= timingStart && funcEnd <= timingEnd) {
func->allocate();
std::memcpy(func->getPtr<uint8_t>(), timing->getPtr<uint8_t>() +
funcStart - timingStart, func->getSize());
func->result = Packet::Success;
func->flags |= SATISFIED;
return false;
} else {
// In this case the timing packet only partially satisfies the
// requset, so we would need more information to make this work.
// Like bytes valid in the packet or something, so the request could
// continue and get this bit of possibly newer data along with the
// older data not written to yet.
panic("Timing packet only partially satisfies the functional"
"request. Now what?");
}
} else if (func->isWrite()) {
if (funcStart >= timingStart) {
std::memcpy(timing->getPtr<uint8_t>() + (funcStart - timingStart),
func->getPtr<uint8_t>(),
(std::min(funcEnd, timingEnd) - funcStart) + 1);
} else { // timingStart > funcStart
std::memcpy(timing->getPtr<uint8_t>(),
func->getPtr<uint8_t>() + (timingStart - funcStart),
(std::min(funcEnd, timingEnd) - timingStart) + 1);
}
// we always want to keep going with a write
return true;
} else
panic("Don't know how to handle command type %#x\n",
func->cmdToIndex());
}
std::ostream &
operator<<(std::ostream &o, const Packet &p)
{
o << "[0x";
o.setf(std::ios_base::hex, std::ios_base::showbase);
o << p.getAddr();
o.unsetf(std::ios_base::hex| std::ios_base::showbase);
o << ":";
o.setf(std::ios_base::hex, std::ios_base::showbase);
o << p.getAddr() + p.getSize() - 1 << "] ";
o.unsetf(std::ios_base::hex| std::ios_base::showbase);
if (p.result == Packet::Success)
o << "Successful ";
if (p.result == Packet::BadAddress)
o << "BadAddress ";
if (p.result == Packet::Nacked)
o << "Nacked ";
if (p.result == Packet::Unknown)
o << "Inflight ";
if (p.isRead())
o << "Read ";
if (p.isWrite())
o << "Read ";
if (p.isInvalidate())
o << "Read ";
if (p.isRequest())
o << "Request ";
if (p.isResponse())
o << "Response ";
if (p.hasData())
o << "w/Data ";
o << std::endl;
return o;
}
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