b00949d88b
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
121 lines
3.9 KiB
C++
121 lines
3.9 KiB
C++
/*
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* Copyright (c) 2012 ARM Limited
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* All rights reserved
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*
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* The license below extends only to copyright in the software and shall
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* not be construed as granting a license to any other intellectual
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* property including but not limited to intellectual property relating
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* to a hardware implementation of the functionality of the software
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* licensed hereunder. You may use the software subject to the license
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* terms below provided that you ensure that this notice is replicated
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* unmodified and in its entirety in all distributions of the software,
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* modified or unmodified, in source code or in binary form.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Andreas Hansson
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*/
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#ifndef __PHYSICAL_MEMORY_HH__
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#define __PHYSICAL_MEMORY_HH__
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#include "base/range_map.hh"
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#include "mem/abstract_mem.hh"
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#include "mem/packet.hh"
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/**
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* The physical memory encapsulates all memories in the system and
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* provides basic functionality for accessing those memories without
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* going through the memory system and interconnect.
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*/
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class PhysicalMemory
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{
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private:
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// Global address map
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range_map<Addr, AbstractMemory* > addrMap;
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// a mutable cache for the last range that matched an address
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mutable Range<Addr> rangeCache;
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// All address-mapped memories
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std::vector<AbstractMemory*> memories;
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// The total memory size
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uint64_t size;
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// Prevent copying
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PhysicalMemory(const PhysicalMemory&);
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// Prevent assignment
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PhysicalMemory& operator=(const PhysicalMemory&);
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public:
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/**
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* Create a physical memory object, wrapping a number of memories.
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*/
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PhysicalMemory(const std::vector<AbstractMemory*>& _memories);
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/**
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* Nothing to destruct.
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*/
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~PhysicalMemory() { }
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/**
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* Check if a physical address is within a range of a memory that
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* is part of the global address map.
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*
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* @param addr A physical address
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* @return Whether the address corresponds to a memory
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*/
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bool isMemAddr(Addr addr) const;
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/**
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* Get the memory ranges for all memories that are to be reported
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* to the configuration table.
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*
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* @return All configuration table memory ranges
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*/
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AddrRangeList getConfAddrRanges() const;
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/**
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* Get the total physical memory size.
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*
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* @return The sum of all memory sizes
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*/
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uint64_t totalSize() const { return size; }
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/**
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*
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*/
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void access(PacketPtr pkt);
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void functionalAccess(PacketPtr pkt);
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};
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#endif //__PHYSICAL_MEMORY_HH__
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