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authorAli Saidi <Ali.Saidi@ARM.com>2012-09-25 11:49:40 -0500
committerAli Saidi <Ali.Saidi@ARM.com>2012-09-25 11:49:40 -0500
commit396600de107220db8c2c8f3951eeb7062ac0e81c (patch)
treec5c1d81488c543d02a3d1547213c21ddd906edc3 /src/mem/addr_mapper.hh
parent0c99d21ad748371e801508a8c3652e07e2e56f93 (diff)
downloadgem5-396600de107220db8c2c8f3951eeb7062ac0e81c.tar.xz
mem: Add a gasket that allows memory ranges to be re-mapped.
For example if DRAM is at two locations and mirrored this patch allows the mirroring to occur.
Diffstat (limited to 'src/mem/addr_mapper.hh')
-rw-r--r--src/mem/addr_mapper.hh294
1 files changed, 294 insertions, 0 deletions
diff --git a/src/mem/addr_mapper.hh b/src/mem/addr_mapper.hh
new file mode 100644
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+++ b/src/mem/addr_mapper.hh
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+/*
+ * Copyright (c) 2012 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder. You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
+ * 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: Andreas Hansson
+ */
+
+#ifndef __MEM_ADDR_MAPPER_HH__
+#define __MEM_ADDR_MAPPER_HH__
+
+#include "mem/mem_object.hh"
+#include "params/AddrMapper.hh"
+#include "params/RangeAddrMapper.hh"
+
+/**
+ * An address mapper changes the packet addresses in going from the
+ * slave port side of the mapper to the master port side. When the
+ * slave port is queried for the address ranges, it also performs the
+ * necessary range updates. Note that snoop requests that travel from
+ * the master port (i.e. the memory side) to the slave port are
+ * currently not modified.
+ */
+
+class AddrMapper : public MemObject
+{
+
+ public:
+
+ AddrMapper(const AddrMapperParams* params);
+
+ virtual ~AddrMapper() { }
+
+ virtual MasterPort& getMasterPort(const std::string& if_name,
+ int idx = -1);
+
+ virtual SlavePort& getSlavePort(const std::string& if_name,
+ int idx = -1);
+
+ virtual void init();
+
+ protected:
+
+ /**
+ * This function does the actual remapping of one address to another.
+ * It is pure virtual in this case to to allow any implementation
+ * required.
+ * @param addr the address to remap
+ * @return the new address (can be unchanged)
+ */
+ virtual Addr remapAddr(Addr addr) const = 0;
+
+ class AddrMapperSenderState : public Packet::SenderState
+ {
+
+ public:
+
+ /**
+ * Construct a new sender state and remember the original one
+ * so that we can implement a stack.
+ *
+ * @param _origSenderState Sender state to remember
+ * @param _origAddr Address before remapping
+ */
+ AddrMapperSenderState(SenderState* _origSenderState,
+ Addr _origAddr)
+ : origSenderState(_origSenderState), origAddr(_origAddr)
+ { }
+
+ /** Destructor */
+ ~AddrMapperSenderState() { }
+
+ /** Pointer to old sender state of packet */
+ SenderState* origSenderState;
+
+ /** The original address the packet was destined for */
+ Addr origAddr;
+
+ };
+
+ class MapperMasterPort : public MasterPort
+ {
+
+ public:
+
+ MapperMasterPort(const std::string& _name, AddrMapper& _mapper)
+ : MasterPort(_name, &_mapper), mapper(_mapper)
+ { }
+
+ protected:
+
+ void recvFunctionalSnoop(PacketPtr pkt)
+ {
+ mapper.recvFunctionalSnoop(pkt);
+ }
+
+ Tick recvAtomicSnoop(PacketPtr pkt)
+ {
+ return mapper.recvAtomicSnoop(pkt);
+ }
+
+ bool recvTimingResp(PacketPtr pkt)
+ {
+ return mapper.recvTimingResp(pkt);
+ }
+
+ void recvTimingSnoopReq(PacketPtr pkt)
+ {
+ mapper.recvTimingSnoopReq(pkt);
+ }
+
+ void recvRangeChange()
+ {
+ mapper.recvRangeChange();
+ }
+
+ bool isSnooping() const
+ {
+ return mapper.isSnooping();
+ }
+
+ unsigned deviceBlockSize() const
+ {
+ return mapper.deviceBlockSizeMaster();
+ }
+
+ void recvRetry()
+ {
+ mapper.recvRetryMaster();
+ }
+
+ private:
+
+ AddrMapper& mapper;
+
+ };
+
+ /** Instance of master port, facing the memory side */
+ MapperMasterPort masterPort;
+
+ class MapperSlavePort : public SlavePort
+ {
+
+ public:
+
+ MapperSlavePort(const std::string& _name, AddrMapper& _mapper)
+ : SlavePort(_name, &_mapper), mapper(_mapper)
+ { }
+
+ protected:
+
+ void recvFunctional(PacketPtr pkt)
+ {
+ mapper.recvFunctional(pkt);
+ }
+
+ Tick recvAtomic(PacketPtr pkt)
+ {
+ return mapper.recvAtomic(pkt);
+ }
+
+ bool recvTimingReq(PacketPtr pkt)
+ {
+ return mapper.recvTimingReq(pkt);
+ }
+
+ bool recvTimingSnoopResp(PacketPtr pkt)
+ {
+ return mapper.recvTimingSnoopResp(pkt);
+ }
+
+ unsigned deviceBlockSize() const
+ {
+ return mapper.deviceBlockSizeSlave();
+ }
+
+ AddrRangeList getAddrRanges() const
+ {
+ return mapper.getAddrRanges();
+ }
+
+ void recvRetry()
+ {
+ mapper.recvRetrySlave();
+ }
+
+ private:
+
+ AddrMapper& mapper;
+
+ };
+
+ /** Instance of slave port, i.e. on the CPU side */
+ MapperSlavePort slavePort;
+
+ void recvFunctional(PacketPtr pkt);
+
+ void recvFunctionalSnoop(PacketPtr pkt);
+
+ Tick recvAtomic(PacketPtr pkt);
+
+ Tick recvAtomicSnoop(PacketPtr pkt);
+
+ bool recvTimingReq(PacketPtr pkt);
+
+ bool recvTimingResp(PacketPtr pkt);
+
+ void recvTimingSnoopReq(PacketPtr pkt);
+
+ bool recvTimingSnoopResp(PacketPtr pkt);
+
+ unsigned deviceBlockSizeMaster();
+
+ unsigned deviceBlockSizeSlave();
+
+ virtual AddrRangeList getAddrRanges() const = 0;
+
+ bool isSnooping() const;
+
+ void recvRetryMaster();
+
+ void recvRetrySlave();
+
+ void recvRangeChange();
+};
+
+/**
+ * Range address mapper that maps a set of original ranges to a set of
+ * remapped ranges, where a specific range is of the same size
+ * (original and remapped), only with an offset. It's useful for cases
+ * where memory is mapped to two different locations
+ */
+class RangeAddrMapper : public AddrMapper
+{
+
+ public:
+
+ RangeAddrMapper(const RangeAddrMapperParams* p);
+
+ ~RangeAddrMapper() { }
+
+ AddrRangeList getAddrRanges() const;
+
+ protected:
+
+ /**
+ * This contains a list of ranges the should be remapped. It must
+ * be the exact same length as remappedRanges which describes what
+ * manipulation should be done to each range.
+ */
+ std::vector<AddrRange> originalRanges;
+
+ /**
+ * This contains a list of ranges that addresses should be
+ * remapped to. See the description for originalRanges above
+ */
+ std::vector<AddrRange> remappedRanges;
+
+ Addr remapAddr(Addr addr) const;
+
+};
+
+#endif //__MEM_ADDR_MAPPER_HH__