234 lines
8.3 KiB
C++
234 lines
8.3 KiB
C++
/*
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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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* Steve Reinhardt
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*/
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/**
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* @file
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* Definition of the Packet Class, a packet is a transaction occuring
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* between a single level of the memory heirarchy (ie L1->L2).
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*/
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#include <iostream>
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#include <cstring>
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#include "base/misc.hh"
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#include "base/trace.hh"
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#include "mem/packet.hh"
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// The one downside to bitsets is that static initializers can get ugly.
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#define SET1(a1) (1 << (a1))
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#define SET2(a1, a2) (SET1(a1) | SET1(a2))
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#define SET3(a1, a2, a3) (SET2(a1, a2) | SET1(a3))
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#define SET4(a1, a2, a3, a4) (SET3(a1, a2, a3) | SET1(a4))
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#define SET5(a1, a2, a3, a4, a5) (SET4(a1, a2, a3, a4) | SET1(a5))
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#define SET6(a1, a2, a3, a4, a5, a6) (SET5(a1, a2, a3, a4, a5) | SET1(a6))
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const MemCmd::CommandInfo
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MemCmd::commandInfo[] =
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{
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/* InvalidCmd */
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{ 0, InvalidCmd, "InvalidCmd" },
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/* ReadReq */
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{ SET3(IsRead, IsRequest, NeedsResponse), ReadResp, "ReadReq" },
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/* ReadResp */
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{ SET3(IsRead, IsResponse, HasData), InvalidCmd, "ReadResp" },
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/* WriteReq */
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{ SET5(IsWrite, NeedsExclusive, IsRequest, NeedsResponse, HasData),
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WriteResp, "WriteReq" },
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/* WriteResp */
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{ SET3(IsWrite, NeedsExclusive, IsResponse), InvalidCmd, "WriteResp" },
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/* Writeback */
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{ SET4(IsWrite, NeedsExclusive, IsRequest, HasData),
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InvalidCmd, "Writeback" },
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/* SoftPFReq */
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{ SET4(IsRead, IsRequest, IsSWPrefetch, NeedsResponse),
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SoftPFResp, "SoftPFReq" },
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/* HardPFReq */
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{ SET4(IsRead, IsRequest, IsHWPrefetch, NeedsResponse),
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HardPFResp, "HardPFReq" },
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/* SoftPFResp */
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{ SET4(IsRead, IsResponse, IsSWPrefetch, HasData),
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InvalidCmd, "SoftPFResp" },
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/* HardPFResp */
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{ SET4(IsRead, IsResponse, IsHWPrefetch, HasData),
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InvalidCmd, "HardPFResp" },
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/* WriteInvalidateReq */
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{ SET6(IsWrite, NeedsExclusive, IsInvalidate,
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IsRequest, HasData, NeedsResponse),
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WriteInvalidateResp, "WriteInvalidateReq" },
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/* WriteInvalidateResp */
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{ SET4(IsWrite, NeedsExclusive, IsInvalidate, IsResponse),
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InvalidCmd, "WriteInvalidateResp" },
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/* UpgradeReq */
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{ SET4(IsInvalidate, NeedsExclusive, IsRequest, NeedsResponse),
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UpgradeResp, "UpgradeReq" },
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/* UpgradeResp */
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{ SET3(IsInvalidate, NeedsExclusive, IsResponse),
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InvalidCmd, "UpgradeResp" },
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/* ReadExReq */
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{ SET5(IsRead, NeedsExclusive, IsInvalidate, IsRequest, NeedsResponse),
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ReadExResp, "ReadExReq" },
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/* ReadExResp */
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{ SET5(IsRead, NeedsExclusive, IsInvalidate, IsResponse, HasData),
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InvalidCmd, "ReadExResp" },
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/* LoadLockedReq */
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{ SET4(IsRead, IsLocked, IsRequest, NeedsResponse),
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LoadLockedResp, "LoadLockedReq" },
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/* LoadLockedResp */
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{ SET4(IsRead, IsLocked, IsResponse, HasData),
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InvalidCmd, "LoadLockedResp" },
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/* StoreCondReq */
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{ SET6(IsWrite, NeedsExclusive, IsLocked,
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IsRequest, NeedsResponse, HasData),
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StoreCondResp, "StoreCondReq" },
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/* StoreCondResp */
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{ SET4(IsWrite, NeedsExclusive, IsLocked, IsResponse),
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InvalidCmd, "StoreCondResp" },
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/* SwapReq -- for Swap ldstub type operations */
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{ SET6(IsRead, IsWrite, NeedsExclusive, IsRequest, HasData, NeedsResponse),
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SwapResp, "SwapReq" },
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/* SwapResp -- for Swap ldstub type operations */
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{ SET5(IsRead, IsWrite, NeedsExclusive, IsResponse, HasData),
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InvalidCmd, "SwapResp" },
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/* NetworkNackError -- nacked at network layer (not by protocol) */
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{ SET2(IsResponse, IsError), InvalidCmd, "NetworkNackError" },
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/* InvalidDestError -- packet dest field invalid */
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{ SET2(IsResponse, IsError), InvalidCmd, "InvalidDestError" },
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/* BadAddressError -- memory address invalid */
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{ SET2(IsResponse, IsError), InvalidCmd, "BadAddressError" }
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};
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/** delete the data pointed to in the data pointer. Ok to call to matter how
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* data was allocted. */
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void
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Packet::deleteData()
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{
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assert(staticData || dynamicData);
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if (staticData)
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return;
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if (arrayData)
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delete [] data;
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else
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delete data;
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}
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/** If there isn't data in the packet, allocate some. */
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void
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Packet::allocate()
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{
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if (data)
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return;
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assert(!staticData);
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dynamicData = true;
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arrayData = true;
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data = new uint8_t[getSize()];
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}
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bool
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Packet::checkFunctional(Addr addr, int size, uint8_t *data)
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{
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Addr func_start = getAddr();
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Addr func_end = getAddr() + getSize() - 1;
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Addr val_start = addr;
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Addr val_end = val_start + size - 1;
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if (func_start > val_end || val_start > func_end) {
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// no intersection
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return false;
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}
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// offset of functional request into supplied value (could be
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// negative if partial overlap)
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int offset = func_start - val_start;
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if (isRead()) {
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if (func_start >= val_start && func_end <= val_end) {
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allocate();
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std::memcpy(getPtr<uint8_t>(), data + offset, getSize());
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makeResponse();
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return true;
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} else {
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// In this case the timing packet only partially satisfies
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// the request, so we would need more information to make
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// this work. Like bytes valid in the packet or
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// something, so the request could continue and get this
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// bit of possibly newer data along with the older data
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// not written to yet.
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panic("Memory value only partially satisfies the functional "
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"request. Now what?");
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}
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} else if (isWrite()) {
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if (offset >= 0) {
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std::memcpy(data + offset, getPtr<uint8_t>(),
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(std::min(func_end, val_end) - func_start) + 1);
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} else { // val_start > func_start
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std::memcpy(data, getPtr<uint8_t>() - offset,
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(std::min(func_end, val_end) - val_start) + 1);
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}
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// we always want to keep going with a write
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return false;
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} else
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panic("Don't know how to handle command %s\n", cmdString());
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}
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std::ostream &
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operator<<(std::ostream &o, const Packet &p)
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{
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o << "[0x";
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o.setf(std::ios_base::hex, std::ios_base::showbase);
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o << p.getAddr();
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o.unsetf(std::ios_base::hex| std::ios_base::showbase);
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o << ":";
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o.setf(std::ios_base::hex, std::ios_base::showbase);
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o << p.getAddr() + p.getSize() - 1 << "] ";
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o.unsetf(std::ios_base::hex| std::ios_base::showbase);
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if (p.isRead())
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o << "Read ";
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if (p.isWrite())
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o << "Write ";
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if (p.isInvalidate())
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o << "Invalidate ";
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if (p.isRequest())
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o << "Request ";
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if (p.isResponse())
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o << "Response ";
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if (p.hasData())
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o << "w/Data ";
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o << std::endl;
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return o;
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}
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