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authorAndreas Hansson <andreas.hansson@arm.com>2012-04-06 13:46:31 -0400
committerAndreas Hansson <andreas.hansson@arm.com>2012-04-06 13:46:31 -0400
commitb00949d88bb3185dfa2e27799de7f90e5a449be8 (patch)
tree74789b938463bcf38d5ffd5e6be5ef7a02d84a58 /src/mem/simple_mem.hh
parentdbe1608fd58d818f59a0adf5f3fb562f61242f99 (diff)
downloadgem5-b00949d88bb3185dfa2e27799de7f90e5a449be8.tar.xz
MEM: Enable multiple distributed generalized memories
This patch removes the assumption on having on single instance of PhysicalMemory, and enables a distributed memory where the individual memories in the system are each responsible for a single contiguous address range. All memories inherit from an AbstractMemory that encompasses the basic behaviuor of a random access memory, and provides untimed access methods. What was previously called PhysicalMemory is now SimpleMemory, and a subclass of AbstractMemory. All future types of memory controllers should inherit from AbstractMemory. To enable e.g. the atomic CPU and RubyPort to access the now distributed memory, the system has a wrapper class, called PhysicalMemory that is aware of all the memories in the system and their associated address ranges. This class thus acts as an infinitely-fast bus and performs address decoding for these "shortcut" accesses. Each memory can specify that it should not be part of the global address map (used e.g. by the functional memories by some testers). Moreover, each memory can be configured to be reported to the OS configuration table, useful for populating ATAG structures, and any potential ACPI tables. Checkpointing support currently assumes that all memories have the same size and organisation when creating and resuming from the checkpoint. A future patch will enable a more flexible re-organisation. --HG-- rename : src/mem/PhysicalMemory.py => src/mem/AbstractMemory.py rename : src/mem/PhysicalMemory.py => src/mem/SimpleMemory.py rename : src/mem/physical.cc => src/mem/abstract_mem.cc rename : src/mem/physical.hh => src/mem/abstract_mem.hh rename : src/mem/physical.cc => src/mem/simple_mem.cc rename : src/mem/physical.hh => src/mem/simple_mem.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.
+ *
+ * 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
+ * Andreas Hansson
+ */
+
+/**
+ * @file
+ * SimpleMemory declaration
+ */
+
+#ifndef __SIMPLE_MEMORY_HH__
+#define __SIMPLE_MEMORY_HH__
+
+#include "mem/abstract_mem.hh"
+#include "mem/tport.hh"
+#include "params/SimpleMemory.hh"
+
+/**
+ * The simple memory is a basic multi-ported memory with an infinite
+ * throughput and a fixed latency, potentially with a variance added
+ * to it. It uses a SimpleTimingPort to implement the timing accesses.
+ */
+class SimpleMemory : public AbstractMemory
+{
+
+ private:
+
+ class MemoryPort : public SimpleTimingPort
+ {
+ SimpleMemory& memory;
+
+ public:
+
+ MemoryPort(const std::string& _name, SimpleMemory& _memory);
+
+ protected:
+
+ virtual Tick recvAtomic(PacketPtr pkt);
+
+ virtual void recvFunctional(PacketPtr pkt);
+
+ virtual AddrRangeList getAddrRanges();
+
+ };
+
+ std::vector<MemoryPort*> ports;
+
+ Tick lat;
+ Tick lat_var;
+
+ public:
+
+ typedef SimpleMemoryParams Params;
+ SimpleMemory(const Params *p);
+ virtual ~SimpleMemory() { }
+
+ unsigned int drain(Event* de);
+
+ virtual SlavePort& getSlavePort(const std::string& if_name, int idx = -1);
+ virtual void init();
+
+ const Params *
+ params() const
+ {
+ return dynamic_cast<const Params *>(_params);
+ }
+
+ protected:
+
+ Tick doAtomicAccess(PacketPtr pkt);
+ void doFunctionalAccess(PacketPtr pkt);
+ virtual Tick calculateLatency(PacketPtr pkt);
+
+};
+
+#endif //__SIMPLE_MEMORY_HH__