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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"
// The one downside to bitsets is that static initializers can get ugly.
#define SET1(a1) (1 << (a1))
#define SET2(a1, a2) (SET1(a1) | SET1(a2))
#define SET3(a1, a2, a3) (SET2(a1, a2) | SET1(a3))
#define SET4(a1, a2, a3, a4) (SET3(a1, a2, a3) | SET1(a4))
#define SET5(a1, a2, a3, a4, a5) (SET4(a1, a2, a3, a4) | SET1(a5))
#define SET6(a1, a2, a3, a4, a5, a6) (SET5(a1, a2, a3, a4, a5) | SET1(a6))
const MemCmd::CommandInfo
MemCmd::commandInfo[] =
{
/* InvalidCmd */
{ 0, InvalidCmd, "InvalidCmd" },
/* ReadReq */
{ SET3(IsRead, IsRequest, NeedsResponse), ReadResp, "ReadReq" },
/* ReadResp */
{ SET3(IsRead, IsResponse, HasData), InvalidCmd, "ReadResp" },
/* WriteReq */
{ SET5(IsWrite, NeedsExclusive, IsRequest, NeedsResponse, HasData),
WriteResp, "WriteReq" },
/* WriteResp */
{ SET3(IsWrite, NeedsExclusive, IsResponse), InvalidCmd, "WriteResp" },
/* Writeback */
{ SET4(IsWrite, NeedsExclusive, IsRequest, HasData),
InvalidCmd, "Writeback" },
/* SoftPFReq */
{ SET4(IsRead, IsRequest, IsSWPrefetch, NeedsResponse),
SoftPFResp, "SoftPFReq" },
/* HardPFReq */
{ SET4(IsRead, IsRequest, IsHWPrefetch, NeedsResponse),
HardPFResp, "HardPFReq" },
/* SoftPFResp */
{ SET4(IsRead, IsResponse, IsSWPrefetch, HasData),
InvalidCmd, "SoftPFResp" },
/* HardPFResp */
{ SET4(IsRead, IsResponse, IsHWPrefetch, HasData),
InvalidCmd, "HardPFResp" },
/* WriteInvalidateReq */
{ SET6(IsWrite, NeedsExclusive, IsInvalidate,
IsRequest, HasData, NeedsResponse),
WriteInvalidateResp, "WriteInvalidateReq" },
/* WriteInvalidateResp */
{ SET4(IsWrite, NeedsExclusive, IsInvalidate, IsResponse),
InvalidCmd, "WriteInvalidateResp" },
/* UpgradeReq */
{ SET4(IsInvalidate, NeedsExclusive, IsRequest, NeedsResponse),
UpgradeResp, "UpgradeReq" },
/* UpgradeResp */
{ SET3(IsInvalidate, NeedsExclusive, IsResponse),
InvalidCmd, "UpgradeResp" },
/* ReadExReq */
{ SET5(IsRead, NeedsExclusive, IsInvalidate, IsRequest, NeedsResponse),
ReadExResp, "ReadExReq" },
/* ReadExResp */
{ SET5(IsRead, NeedsExclusive, IsInvalidate, IsResponse, HasData),
InvalidCmd, "ReadExResp" },
/* LoadLockedReq */
{ SET4(IsRead, IsLocked, IsRequest, NeedsResponse),
LoadLockedResp, "LoadLockedReq" },
/* LoadLockedResp */
{ SET4(IsRead, IsLocked, IsResponse, HasData),
InvalidCmd, "LoadLockedResp" },
/* StoreCondReq */
{ SET6(IsWrite, NeedsExclusive, IsLocked,
IsRequest, NeedsResponse, HasData),
StoreCondResp, "StoreCondReq" },
/* StoreCondResp */
{ SET4(IsWrite, NeedsExclusive, IsLocked, IsResponse),
InvalidCmd, "StoreCondResp" },
/* SwapReq -- for Swap ldstub type operations */
{ SET6(IsRead, IsWrite, NeedsExclusive, IsRequest, HasData, NeedsResponse),
SwapResp, "SwapReq" },
/* SwapResp -- for Swap ldstub type operations */
{ SET5(IsRead, IsWrite, NeedsExclusive, IsResponse, HasData),
InvalidCmd, "SwapResp" },
/* NetworkNackError -- nacked at network layer (not by protocol) */
{ SET2(IsRequest, IsError), InvalidCmd, "NetworkNackError" },
/* InvalidDestError -- packet dest field invalid */
{ SET2(IsRequest, IsError), InvalidCmd, "InvalidDestError" },
/* BadAddressError -- memory address invalid */
{ SET2(IsRequest, IsError), InvalidCmd, "BadAddressError" }
};
/** 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()];
}
bool
Packet::checkFunctional(Addr addr, int size, uint8_t *data)
{
Addr func_start = getAddr();
Addr func_end = getAddr() + getSize() - 1;
Addr val_start = addr;
Addr val_end = val_start + size - 1;
if (func_start > val_end || val_start > func_end) {
// no intersection
return false;
}
// offset of functional request into supplied value (could be
// negative if partial overlap)
int offset = func_start - val_start;
if (isRead()) {
if (func_start >= val_start && func_end <= val_end) {
allocate();
std::memcpy(getPtr<uint8_t>(), data + offset, getSize());
makeResponse();
return true;
} else {
// In this case the timing packet only partially satisfies
// the request, 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("Memory value only partially satisfies the functional "
"request. Now what?");
}
} else if (isWrite()) {
if (offset >= 0) {
std::memcpy(data + offset, getPtr<uint8_t>(),
(std::min(func_end, val_end) - func_start) + 1);
} else { // val_start > func_start
std::memcpy(data, getPtr<uint8_t>() - offset,
(std::min(func_end, val_end) - val_start) + 1);
}
// we always want to keep going with a write
return false;
} else
panic("Don't know how to handle command %s\n", cmdString());
}
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.isRead())
o << "Read ";
if (p.isWrite())
o << "Write ";
if (p.isInvalidate())
o << "Invalidate ";
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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