physical.hh

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/*
 * Copyright (c) 2012 ARM Limited
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 *
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 * 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
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 * modified or unmodified, in source code or in binary form.
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 * modification, are permitted provided that the following conditions are
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 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
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 * this software without specific prior written permission.
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * Authors: Andreas Hansson
 */

#ifndef __MEM_PHYSICAL_HH__
#define __MEM_PHYSICAL_HH__

#include "base/addr_range_map.hh"
#include "mem/packet.hh"

class AbstractMemory;

class BackingStoreEntry
{
  public:

    BackingStoreEntry(AddrRange range, uint8_t* pmem,
                      bool conf_table_reported, bool in_addr_map, bool kvm_map)
        : range(range), pmem(pmem), confTableReported(conf_table_reported),
          inAddrMap(in_addr_map), kvmMap(kvm_map)
        {}

     AddrRange range;

     uint8_t* pmem;

     bool confTableReported;

     bool inAddrMap;

     bool kvmMap;
};

class PhysicalMemory : public Serializable
{

  private:

    // Name for debugging
    std::string _name;

    // Global address map
    AddrRangeMap<AbstractMemory*> addrMap;

    // a mutable cache for the last address map iterator that matched
    // an address
    mutable AddrRangeMap<AbstractMemory*>::const_iterator rangeCache;

    // All address-mapped memories
    std::vector<AbstractMemory*> memories;

    // The total memory size
    uint64_t size;

    // Let the user choose if we reserve swap space when calling mmap
    const bool mmapUsingNoReserve;

    // The physical memory used to provide the memory in the simulated
    // system
    std::vector<BackingStoreEntry> backingStore;

    // Prevent copying
    PhysicalMemory(const PhysicalMemory&);

    // Prevent assignment
    PhysicalMemory& operator=(const PhysicalMemory&);

    void createBackingStore(AddrRange range,
                            const std::vector<AbstractMemory*>& _memories,
                            bool conf_table_reported,
                            bool in_addr_map, bool kvm_map);

  public:

    PhysicalMemory(const std::string& _name,
                   const std::vector<AbstractMemory*>& _memories,
                   bool mmap_using_noreserve);

    ~PhysicalMemory();

    const std::string name() const { return _name; }

    bool isMemAddr(Addr addr) const;

    AddrRangeList getConfAddrRanges() const;

    uint64_t totalSize() const { return size; }

    std::vector<BackingStoreEntry> getBackingStore() const
    { return backingStore; }

    void access(PacketPtr pkt);

    void functionalAccess(PacketPtr pkt);

    void serialize(CheckpointOut &cp) const override;

    void serializeStore(CheckpointOut &cp, unsigned int store_id,
                        AddrRange range, uint8_t* pmem) const;

    void unserialize(CheckpointIn &cp) override;

    void unserializeStore(CheckpointIn &cp);

};

#endif //__MEM_PHYSICAL_HH__