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/*
* Copyright (c) 2001-2005 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: Ron Dreslinski
*/
/* @file
*/
#ifndef __PHYSICAL_MEMORY_HH__
#define __PHYSICAL_MEMORY_HH__
#include "base/range.hh"
#include "mem/mem_object.hh"
#include "mem/packet.hh"
#include "mem/tport.hh"
#include "sim/eventq.hh"
#include <map>
#include <string>
//
// Functional model for a contiguous block of physical memory. (i.e. RAM)
//
class PhysicalMemory : public MemObject
{
class MemoryPort : public SimpleTimingPort
{
PhysicalMemory *memory;
public:
MemoryPort(const std::string &_name, PhysicalMemory *_memory);
protected:
virtual Tick recvAtomic(PacketPtr pkt);
virtual void recvFunctional(PacketPtr pkt);
virtual void recvStatusChange(Status status);
virtual void getDeviceAddressRanges(AddrRangeList &resp,
AddrRangeList &snoop);
virtual int deviceBlockSize();
};
int numPorts;
private:
// prevent copying of a MainMemory object
PhysicalMemory(const PhysicalMemory &specmem);
const PhysicalMemory &operator=(const PhysicalMemory &specmem);
protected:
class LockedAddr {
public:
// on alpha, minimum LL/SC granularity is 16 bytes, so lower
// bits need to masked off.
static const Addr Addr_Mask = 0xf;
static Addr mask(Addr paddr) { return (paddr & ~Addr_Mask); }
Addr addr; // locked address
int cpuNum; // locking CPU
int threadNum; // locking thread ID within CPU
// check for matching execution context
bool matchesContext(Request *req)
{
return (cpuNum == req->getCpuNum() &&
threadNum == req->getThreadNum());
}
LockedAddr(Request *req)
: addr(mask(req->getPaddr())),
cpuNum(req->getCpuNum()),
threadNum(req->getThreadNum())
{
}
};
std::list<LockedAddr> lockedAddrList;
// helper function for checkLockedAddrs(): we really want to
// inline a quick check for an empty locked addr list (hopefully
// the common case), and do the full list search (if necessary) in
// this out-of-line function
bool checkLockedAddrList(Request *req);
// Record the address of a load-locked operation so that we can
// clear the execution context's lock flag if a matching store is
// performed
void trackLoadLocked(Request *req);
// Compare a store address with any locked addresses so we can
// clear the lock flag appropriately. Return value set to 'false'
// if store operation should be suppressed (because it was a
// conditional store and the address was no longer locked by the
// requesting execution context), 'true' otherwise. Note that
// this method must be called on *all* stores since even
// non-conditional stores must clear any matching lock addresses.
bool writeOK(Request *req) {
if (lockedAddrList.empty()) {
// no locked addrs: nothing to check, store_conditional fails
bool isLocked = req->isLocked();
if (isLocked) {
req->setExtraData(0);
}
return !isLocked; // only do write if not an sc
} else {
// iterate over list...
return checkLockedAddrList(req);
}
}
uint8_t *pmemAddr;
MemoryPort *port;
int pagePtr;
Tick lat;
public:
Addr new_page();
uint64_t size() { return params()->addrRange.size(); }
uint64_t start() { return params()->addrRange.start; }
struct Params
{
std::string name;
Range<Addr> addrRange;
Tick latency;
bool zero;
};
protected:
Params *_params;
public:
const Params *params() const { return _params; }
PhysicalMemory(Params *p);
virtual ~PhysicalMemory();
public:
int deviceBlockSize();
void getAddressRanges(AddrRangeList &resp, AddrRangeList &snoop);
virtual Port *getPort(const std::string &if_name, int idx = -1);
void virtual init();
unsigned int drain(Event *de);
protected:
void doFunctionalAccess(PacketPtr pkt);
virtual Tick calculateLatency(PacketPtr pkt);
void recvStatusChange(Port::Status status);
public:
virtual void serialize(std::ostream &os);
virtual void unserialize(Checkpoint *cp, const std::string §ion);
};
#endif //__PHYSICAL_MEMORY_HH__
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