gem5/mem/bus.cc
Ali Saidi 53d93ef918 add a bridge object, modify bus object to be able to connect to other buses or bridges without panicing
SConscript:
    add new cc files to scons
mem/bus.cc:
mem/bus.hh:
    implement addressRanges() on the bus.
    propigate address ranges to anyone who is interested stripping out ranges of who your propigating to (to avoid livelock)
mem/packet.hh:
    add intersect function that returns true if two packets touch at least one byte of the same data (for functional access)
    add fixPacket() that will eventually take the correct action giving a timing and functional packet, right now it panics
mem/physical.cc:
    Don't panic if the physical memory recieves a status change, just ignore.

--HG--
extra : convert_revision : d470d51f2fb1db2700ad271e09792315ef33ba01
2006-04-28 15:37:48 -04:00

180 lines
5.4 KiB
C++

/*
* 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.
*/
/**
* @file Definition of a bus object.
*/
#include "base/trace.hh"
#include "mem/bus.hh"
#include "sim/builder.hh"
/** Get the ranges of anyone that we are connected to. */
void
Bus::init()
{
std::vector<Port*>::iterator intIter;
for (intIter = interfaces.begin(); intIter != interfaces.end(); intIter++)
(*intIter)->sendStatusChange(Port::RangeChange);
}
/** Function called by the port when the bus is recieving a Timing
* transaction.*/
bool
Bus::recvTiming(Packet &pkt, int id)
{
return findPort(pkt.addr, id)->sendTiming(pkt);
}
Port *
Bus::findPort(Addr addr, int id)
{
/* An interval tree would be a better way to do this. --ali. */
int dest_id = -1;
int i = 0;
bool found = false;
while (i < portList.size() && !found)
{
if (portList[i].range == addr) {
dest_id = portList[i].portId;
found = true;
DPRINTF(Bus, "Found Addr: %llx on device %d\n", addr, dest_id);
}
i++;
}
if (dest_id == -1)
panic("Unable to find destination for addr: %llx", addr);
// we shouldn't be sending this back to where it came from
assert(dest_id != id);
return interfaces[dest_id];
}
/** Function called by the port when the bus is recieving a Atomic
* transaction.*/
Tick
Bus::recvAtomic(Packet &pkt, int id)
{
return findPort(pkt.addr, id)->sendAtomic(pkt);
}
/** Function called by the port when the bus is recieving a Functional
* transaction.*/
void
Bus::recvFunctional(Packet &pkt, int id)
{
findPort(pkt.addr, id)->sendFunctional(pkt);
}
/** Function called by the port when the bus is recieving a status change.*/
void
Bus::recvStatusChange(Port::Status status, int id)
{
DPRINTF(Bus, "Bus %d recieved status change from device id %d\n",
busId, id);
assert(status == Port::RangeChange &&
"The other statuses need to be implemented.");
assert(id < interfaces.size() && id >= 0);
int x;
Port *port = interfaces[id];
AddrRangeList ranges;
AddrRangeList snoops;
AddrRangeIter iter;
std::vector<DevMap>::iterator portIter;
// Clean out any previously existent ids
for (portIter = portList.begin(); portIter != portList.end(); ) {
if (portIter->portId == id)
portIter = portList.erase(portIter);
else
portIter++;
}
port->getPeerAddressRanges(ranges, snoops);
// not dealing with snooping yet either
assert(snoops.size() == 0);
for(iter = ranges.begin(); iter != ranges.end(); iter++) {
DevMap dm;
dm.portId = id;
dm.range = *iter;
DPRINTF(MMU, "Adding range %llx - %llx for id %d\n", dm.range.start,
dm.range.end, id);
portList.push_back(dm);
}
DPRINTF(MMU, "port list has %d entries\n", portList.size());
// tell all our peers that our address range has changed.
// Don't tell the device that caused this change, it already knows
for (x = 0; x < interfaces.size(); x++)
if (x != id)
interfaces[x]->sendStatusChange(Port::RangeChange);
}
void
Bus::addressRanges(AddrRangeList &resp, AddrRangeList &snoop, int id)
{
std::vector<DevMap>::iterator portIter;
resp.clear();
snoop.clear();
DPRINTF(Bus, "Bus id %d recieved address range request returning\n",
busId);
for (portIter = portList.begin(); portIter != portList.end(); portIter++) {
if (portIter->portId != id) {
resp.push_back(portIter->range);
DPRINTF(Bus, "-- %#llX : %#llX\n", portIter->range.start,
portIter->range.end);
}
}
}
BEGIN_DECLARE_SIM_OBJECT_PARAMS(Bus)
Param<int> bus_id;
END_DECLARE_SIM_OBJECT_PARAMS(Bus)
BEGIN_INIT_SIM_OBJECT_PARAMS(Bus)
INIT_PARAM(bus_id, "a globally unique bus id")
END_INIT_SIM_OBJECT_PARAMS(Bus)
CREATE_SIM_OBJECT(Bus)
{
return new Bus(getInstanceName(), bus_id);
}
REGISTER_SIM_OBJECT("Bus", Bus)