addr_mapper.cc

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/*
 * Copyright (c) 2012 ARM Limited
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#include "mem/addr_mapper.hh"
 
namespace gem5
{
 
AddrMapper::AddrMapper(const AddrMapperParams &p)
    : SimObject(p),
      memSidePort(name() + "-mem_side_port", *this),
      cpuSidePort(name() + "-cpu_side_port", *this)
{
}
 
void
AddrMapper::init()
{
    if (!cpuSidePort.isConnected() || !memSidePort.isConnected())
        fatal("Address mapper is not connected on both sides.\n");
}
 
Port &
AddrMapper::getPort(const std::string &if_name, PortID idx)
{
    if (if_name == "mem_side_port") {
        return memSidePort;
    } else if (if_name == "cpu_side_port") {
        return cpuSidePort;
    } else {
        return SimObject::getPort(if_name, idx);
    }
}
 
void
AddrMapper::recvFunctional(PacketPtr pkt)
{
    Addr orig_addr = pkt->getAddr();
    pkt->setAddr(remapAddr(orig_addr));
    memSidePort.sendFunctional(pkt);
    pkt->setAddr(orig_addr);
}
 
void
AddrMapper::recvFunctionalSnoop(PacketPtr pkt)
{
    Addr orig_addr = pkt->getAddr();
    pkt->setAddr(remapAddr(orig_addr));
    cpuSidePort.sendFunctionalSnoop(pkt);
    pkt->setAddr(orig_addr);
}
 
void
AddrMapper::recvMemBackdoorReq(const MemBackdoorReq &req,
                               MemBackdoorPtr &backdoor)
{
    AddrRange remapped_req_range = AddrRange(remapAddr(req.range().start()),
                                             remapAddr(req.range().end()));
    MemBackdoorReq remapped_req(remapped_req_range, req.flags());
    memSidePort.sendMemBackdoorReq(remapped_req, backdoor);
    if (backdoor != nullptr) {
        backdoor = getRevertedBackdoor(backdoor, req.range());
    }
}
 
Tick
AddrMapper::recvAtomic(PacketPtr pkt)
{
    Addr orig_addr = pkt->getAddr();
    pkt->setAddr(remapAddr(orig_addr));
    Tick ret_tick =  memSidePort.sendAtomic(pkt);
    pkt->setAddr(orig_addr);
    return ret_tick;
}
 
Tick
AddrMapper::recvAtomicSnoop(PacketPtr pkt)
{
    Addr orig_addr = pkt->getAddr();
    pkt->setAddr(remapAddr(orig_addr));
    Tick ret_tick = cpuSidePort.sendAtomicSnoop(pkt);
    pkt->setAddr(orig_addr);
    return ret_tick;
}
 
Tick
AddrMapper::recvAtomicBackdoor(PacketPtr pkt, MemBackdoorPtr& backdoor)
{
    Addr orig_addr = pkt->getAddr();
    pkt->setAddr(remapAddr(orig_addr));
    Tick ret_tick = memSidePort.sendAtomicBackdoor(pkt, backdoor);
    pkt->setAddr(orig_addr);
    if (backdoor != nullptr) {
        backdoor = getRevertedBackdoor(backdoor, pkt->getAddrRange());
    }
    return ret_tick;
}
 
bool
AddrMapper::recvTimingReq(PacketPtr pkt)
{
    Addr orig_addr = pkt->getAddr();
    bool needsResponse = pkt->needsResponse();
    bool cacheResponding = pkt->cacheResponding();
 
    if (needsResponse && !cacheResponding) {
        pkt->pushSenderState(new AddrMapperSenderState(orig_addr));
    }
 
    pkt->setAddr(remapAddr(orig_addr));
 
    // Attempt to send the packet
    bool successful = memSidePort.sendTimingReq(pkt);
 
    // If not successful, restore the address and sender state
    if (!successful) {
        pkt->setAddr(orig_addr);
 
        if (needsResponse) {
            delete pkt->popSenderState();
        }
    }
 
    return successful;
}
 
bool
AddrMapper::recvTimingResp(PacketPtr pkt)
{
    AddrMapperSenderState* receivedState =
        dynamic_cast<AddrMapperSenderState*>(pkt->senderState);
 
    // Restore initial sender state
    if (receivedState == NULL)
        panic("AddrMapper %s got a response without sender state\n",
              name());
 
    Addr remapped_addr = pkt->getAddr();
 
    // Restore the state and address
    pkt->senderState = receivedState->predecessor;
    pkt->setAddr(receivedState->origAddr);
 
    // Attempt to send the packet
    bool successful = cpuSidePort.sendTimingResp(pkt);
 
    // If packet successfully sent, delete the sender state, otherwise
    // restore state
    if (successful) {
        delete receivedState;
    } else {
        // Don't delete anything and let the packet look like we did
        // not touch it
        pkt->senderState = receivedState;
        pkt->setAddr(remapped_addr);
    }
    return successful;
}
 
void
AddrMapper::recvTimingSnoopReq(PacketPtr pkt)
{
    cpuSidePort.sendTimingSnoopReq(pkt);
}
 
bool
AddrMapper::recvTimingSnoopResp(PacketPtr pkt)
{
    return memSidePort.sendTimingSnoopResp(pkt);
}
 
bool
AddrMapper::isSnooping() const
{
    if (cpuSidePort.isSnooping())
        fatal("AddrMapper doesn't support remapping of snooping requests\n");
    return false;
}
 
void
AddrMapper::recvReqRetry()
{
    cpuSidePort.sendRetryReq();
}
 
void
AddrMapper::recvRespRetry()
{
    memSidePort.sendRetryResp();
}
 
void
AddrMapper::recvRangeChange()
{
    cpuSidePort.sendRangeChange();
}
 
RangeAddrMapper::RangeAddrMapper(const RangeAddrMapperParams &p) :
    AddrMapper(p),
    originalRanges(p.original_ranges),
    remappedRanges(p.remapped_ranges),
    backdoorManager(originalRanges, remappedRanges)
{
    if (originalRanges.size() != remappedRanges.size())
        fatal("AddrMapper: original and shadowed range list must "
              "be same size\n");
 
    for (size_t x = 0; x < originalRanges.size(); x++) {
        if (originalRanges[x].size() != remappedRanges[x].size())
            fatal("AddrMapper: original and shadowed range list elements"
                  " aren't all of the same size\n");
    }
}
 
Addr
RangeAddrMapper::remapAddr(Addr addr) const
{
    for (int i = 0; i < originalRanges.size(); ++i) {
        if (originalRanges[i].contains(addr)) {
            Addr offset = addr - originalRanges[i].start();
            return offset + remappedRanges[i].start();
        }
    }
 
    return addr;
}
 
MemBackdoorPtr
RangeAddrMapper::getRevertedBackdoor(MemBackdoorPtr &backdoor,
                                     const AddrRange &range)
{
    return backdoorManager.getRevertedBackdoor(backdoor, range);
}
 
AddrRangeList
RangeAddrMapper::getAddrRanges() const
{
    // Simply return the original ranges as given by the parameters
    AddrRangeList ranges(originalRanges.begin(), originalRanges.end());
    return ranges;
}
 
} // namespace gem5