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.

5 files changed, 670 insertions, 0 deletions

diff --git a/src/mem/AddrMapper.py b/src/mem/AddrMapper.py
new file mode 100644
index 000000000..2b999ee92
--- /dev/null
+++ b/src/mem/AddrMapper.py
@@ -0,0 +1,70 @@
+# 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
+
+from m5.params import *
+from MemObject import MemObject
+
+# 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(MemObject):
+    type = 'AddrMapper'
+    abstract = True
+
+    # one port in each direction
+    master = MasterPort("Master port")
+    slave = SlavePort("Slave port")
+
+
+# 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.
+class RangeAddrMapper(AddrMapper):
+    type = 'RangeAddrMapper'
+
+    # These two vectors should be the exact same length and each range
+    # should be the exact same size. Each range in original_ranges is
+    # mapped to the corresponding element in the remapped_ranges. Note
+    # that the same range can occur multiple times in the remapped
+    # ranges for address aliasing.
+    original_ranges = VectorParam.AddrRange(
+        "Ranges of memory that should me remapped")
+    remapped_ranges = VectorParam.AddrRange(
+        "Ranges of memory that are being mapped to")
diff --git a/src/mem/SConscript b/src/mem/SConscript
index 1c43975df..9cf8b08d1 100644
--- a/src/mem/SConscript
+++ b/src/mem/SConscript
@@ -30,11 +30,13 @@
 
 Import('*')
 
+SimObject('AddrMapper.py')
 SimObject('Bridge.py')
 SimObject('Bus.py')
 SimObject('CommMonitor.py')
 SimObject('MemObject.py')
 
+Source('addr_mapper.cc')
 Source('bridge.cc')
 Source('bus.cc')
 Source('coherent_bus.cc')
diff --git a/src/mem/addr_mapper.cc b/src/mem/addr_mapper.cc
new file mode 100644
index 000000000..53e8277cc
--- /dev/null
+++ b/src/mem/addr_mapper.cc
@@ -0,0 +1,295 @@
+/*
+ * 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
+ */
+
+#include "mem/addr_mapper.hh"
+
+AddrMapper::AddrMapper(const AddrMapperParams* p)
+    : MemObject(p),
+      masterPort(name() + "-master", *this),
+      slavePort(name() + "-slave", *this)
+{
+}
+
+void
+AddrMapper::init()
+{
+    if (!slavePort.isConnected() || !masterPort.isConnected())
+        fatal("Address mapper is not connected on both sides.\n");
+
+    if ((slavePort.peerBlockSize() != masterPort.peerBlockSize()) &&
+        slavePort.peerBlockSize() && masterPort.peerBlockSize())
+        fatal("Slave port size %d, master port size %d \n "
+              "don't have the same block size... Not supported.\n",
+              slavePort.peerBlockSize(), masterPort.peerBlockSize());
+}
+
+MasterPort&
+AddrMapper::getMasterPort(const std::string& if_name, int idx)
+{
+    if (if_name == "master") {
+        return masterPort;
+    } else {
+        return MemObject::getMasterPort(if_name, idx);
+    }
+}
+
+SlavePort&
+AddrMapper::getSlavePort(const std::string& if_name, int idx)
+{
+    if (if_name == "slave") {
+        return slavePort;
+    } else {
+        return MemObject::getSlavePort(if_name, idx);
+    }
+}
+
+void
+AddrMapper::recvFunctional(PacketPtr pkt)
+{
+    Addr orig_addr = pkt->getAddr();
+    pkt->setAddr(remapAddr(orig_addr));
+    masterPort.sendFunctional(pkt);
+    pkt->setAddr(orig_addr);
+}
+
+void
+AddrMapper::recvFunctionalSnoop(PacketPtr pkt)
+{
+    Addr orig_addr = pkt->getAddr();
+    pkt->setAddr(remapAddr(orig_addr));
+    slavePort.sendFunctionalSnoop(pkt);
+    pkt->setAddr(orig_addr);
+}
+
+Tick
+AddrMapper::recvAtomic(PacketPtr pkt)
+{
+    Addr orig_addr = pkt->getAddr();
+    pkt->setAddr(remapAddr(orig_addr));
+    Tick ret_tick =  masterPort.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 = slavePort.sendAtomicSnoop(pkt);
+    pkt->setAddr(orig_addr);
+    return ret_tick;
+}
+
+bool
+AddrMapper::recvTimingReq(PacketPtr pkt)
+{
+    Addr orig_addr = pkt->getAddr();
+    bool needsResponse = pkt->needsResponse();
+    bool memInhibitAsserted = pkt->memInhibitAsserted();
+    Packet::SenderState* senderState = pkt->senderState;
+
+    if (needsResponse && !memInhibitAsserted) {
+        pkt->senderState = new AddrMapperSenderState(senderState, orig_addr);
+    }
+
+    pkt->setAddr(remapAddr(orig_addr));
+
+    // Attempt to send the packet (always succeeds for inhibited
+    // packets)
+    bool successful = masterPort.sendTimingReq(pkt);
+
+    // If not successful, restore the sender state
+    if (!successful && needsResponse) {
+        delete pkt->senderState;
+        pkt->senderState = senderState;
+    }
+
+    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->origSenderState;
+    pkt->setAddr(receivedState->origAddr);
+
+    // Attempt to send the packet
+    bool successful = slavePort.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)
+{
+    slavePort.sendTimingSnoopReq(pkt);
+}
+
+bool
+AddrMapper::recvTimingSnoopResp(PacketPtr pkt)
+{
+    return masterPort.sendTimingSnoopResp(pkt);
+}
+
+bool
+AddrMapper::isSnooping() const
+{
+    if (slavePort.getMasterPort().isSnooping())
+        fatal("AddrMapper doesn't support remapping of snooping requests\n");
+    return false;
+}
+
+unsigned
+AddrMapper::deviceBlockSizeMaster()
+{
+    return slavePort.peerBlockSize();
+}
+
+unsigned
+AddrMapper::deviceBlockSizeSlave()
+{
+    return masterPort.peerBlockSize();
+}
+
+void
+AddrMapper::recvRetryMaster()
+{
+    slavePort.sendRetry();
+}
+
+void
+AddrMapper::recvRetrySlave()
+{
+    masterPort.sendRetry();
+}
+
+void
+AddrMapper::recvRangeChange()
+{
+    slavePort.sendRangeChange();
+}
+
+RangeAddrMapper::RangeAddrMapper(const RangeAddrMapperParams* p) :
+    AddrMapper(p),
+    originalRanges(p->original_ranges),
+    remappedRanges(p->remapped_ranges)
+{
+    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");
+    }
+}
+
+RangeAddrMapper*
+RangeAddrMapperParams::create()
+{
+    return new RangeAddrMapper(this);
+}
+
+Addr
+RangeAddrMapper::remapAddr(Addr addr) const
+{
+    for (int i = 0; i < originalRanges.size(); ++i) {
+        if (originalRanges[i] == addr) {
+            Addr offset = addr - originalRanges[i].start;
+            return offset + remappedRanges[i].start;
+        }
+    }
+
+    return addr;
+}
+
+AddrRangeList
+RangeAddrMapper::getAddrRanges() const
+{
+    AddrRangeList ranges;
+    AddrRangeList actualRanges = masterPort.getSlavePort().getAddrRanges();
+
+    for (AddrRangeIter r = actualRanges.begin(); r != actualRanges.end(); ++r) {
+        AddrRange range = *r;
+
+        for (int j = 0; j < originalRanges.size(); ++j) {
+            if ((range.start < originalRanges[j].start &&
+                 range.end >= originalRanges[j].start) ||
+                (range.start < originalRanges[j].end &&
+                 range.end >= originalRanges[j].end))
+                fatal("Cannot remap range that intersects the original"
+                      " ranges but are not a subset.\n");
+            if (range.start >= originalRanges[j].start &&
+                range.end <= originalRanges[j].end) {
+                // range is a subset
+                Addr offset = range.start - originalRanges[j].start;
+                range.start -= offset;
+                range.end -= offset;
+            }
+            ranges.push_back(range);
+        }
+    }
+
+    return ranges;
+}
+
+
diff --git a/src/mem/addr_mapper.hh b/src/mem/addr_mapper.hh
new file mode 100644
index 000000000..f469b26ba
--- /dev/null
+++ b/src/mem/addr_mapper.hh
@@ -0,0 +1,294 @@
+/*
+ * 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__
diff --git a/src/mem/packet.hh b/src/mem/packet.hh
index 7396048d6..fbcf185cc 100644
--- a/src/mem/packet.hh
+++ b/src/mem/packet.hh
@@ -491,6 +491,15 @@ class Packet : public Printable
     void clearDest() { dest = InvalidPortID; }
 
     Addr getAddr() const { assert(flags.isSet(VALID_ADDR)); return addr; }
+    /**
+     * Update the address of this packet mid-transaction. This is used
+     * by the address mapper to change an already set address to a new
+     * one based on the system configuration. It is intended to remap
+     * an existing address, so it asserts that the current address is
+     * valid.
+     */
+    void setAddr(Addr _addr) { assert(flags.isSet(VALID_ADDR)); addr = _addr; }
+
     unsigned getSize() const  { assert(flags.isSet(VALID_SIZE)); return size; }
     Addr getOffset(int blkSize) const { return getAddr() & (Addr)(blkSize - 1); }