src/mem/physical.hh

   1 /*
   2  * Copyright (c) 2001-2005 The Regents of The University of Michigan
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Ron Dreslinski
  29  */
  30
  31 /* @file
  32  */
  33
  34 #ifndef __PHYSICAL_MEMORY_HH__
  35 #define __PHYSICAL_MEMORY_HH__
  36
  37 #include "base/range.hh"
  38 #include "mem/mem_object.hh"
  39 #include "mem/packet.hh"
  40 #include "mem/port.hh"
  41 #include "sim/eventq.hh"
  42 #include <map>
  43 #include <string>
  44
  45 //
  46 // Functional model for a contiguous block of physical memory. (i.e. RAM)
  47 //
  48 class PhysicalMemory : public MemObject
  49 {
  50     class MemoryPort : public Port
  51     {
  52         PhysicalMemory *memory;
  53
  54       public:
  55
  56         MemoryPort(const std::string &_name, PhysicalMemory *_memory);
  57
  58       protected:
  59
  60         virtual bool recvTiming(Packet *pkt);
  61
  62         virtual Tick recvAtomic(Packet *pkt);
  63
  64         virtual void recvFunctional(Packet *pkt);
  65
  66         virtual void recvStatusChange(Status status);
  67
  68         virtual void getDeviceAddressRanges(AddrRangeList &resp,
  69                                             AddrRangeList &snoop);
  70
  71         virtual int deviceBlockSize();
  72     };
  73
  74     int numPorts;
  75
  76
  77     struct MemResponseEvent : public Event
  78     {
  79         Packet *pkt;
  80         MemoryPort *memoryPort;
  81
  82         MemResponseEvent(Packet *pkt, MemoryPort *memoryPort);
  83         void process();
  84         const char *description();
  85     };
  86
  87   private:
  88     // prevent copying of a MainMemory object
  89     PhysicalMemory(const PhysicalMemory &specmem);
  90     const PhysicalMemory &operator=(const PhysicalMemory &specmem);
  91
  92   protected:
  93     Addr base_addr;
  94     Addr pmem_size;
  95     uint8_t *pmem_addr;
  96     MemoryPort *port;
  97     int page_ptr;
  98     Tick lat;
  99
 100   public:
 101     Addr new_page();
 102     uint64_t size() { return pmem_size; }
 103
 104   public:
 105     PhysicalMemory(const std::string &n, Tick latency);
 106     virtual ~PhysicalMemory();
 107
 108   public:
 109     int deviceBlockSize();
 110     void getAddressRanges(AddrRangeList &resp, AddrRangeList &snoop);
 111     virtual Port *getPort(const std::string &if_name, int idx = -1);
 112     void virtual init();
 113
 114     // fast back-door memory access for vtophys(), remote gdb, etc.
 115     // uint64_t phys_read_qword(Addr addr) const;
 116   private:
 117     bool doTimingAccess(Packet *pkt, MemoryPort *memoryPort);
 118     Tick doAtomicAccess(Packet *pkt);
 119     void doFunctionalAccess(Packet *pkt);
 120
 121     void recvStatusChange(Port::Status status);
 122
 123   public:
 124     virtual void serialize(std::ostream &os);
 125     virtual void unserialize(Checkpoint *cp, const std::string &section);
 126
 127 };
 128
 129 #endif //__PHYSICAL_MEMORY_HH__