abstract_mem.hh revision 2462 
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
29/* @file
30 */
31
32#ifndef __PHYSICAL_MEMORY_HH__
33#define __PHYSICAL_MEMORY_HH__
34
35#include "base/range.hh"
36#include "mem/mem_object.hh"
37#include "mem/packet.hh"
38#include "mem/port.hh"
39#include "sim/eventq.hh"
40#include <map>
41#include <string>
42
43//
44// Functional model for a contiguous block of physical memory. (i.e. RAM)
45//
46class PhysicalMemory : public MemObject
47{
48    class MemoryPort : public Port
49    {
50        PhysicalMemory *memory;
51
52      public:
53
54        MemoryPort(PhysicalMemory *_memory);
55
56      protected:
57
58        virtual bool recvTiming(Packet &pkt);
59
60        virtual Tick recvAtomic(Packet &pkt);
61
62        virtual void recvFunctional(Packet &pkt);
63
64        virtual void recvStatusChange(Status status);
65
66        virtual void getDeviceAddressRanges(AddrRangeList &range_list,
67                                            bool &owner);
68
69        virtual int deviceBlockSize();
70    };
71
72    virtual Port * getPort(const char *if_name);
73
74    int numPorts;
75
76    int lat;
77
78    struct MemResponseEvent : public Event
79    {
80        Packet &pkt;
81        MemoryPort *memoryPort;
82
83        MemResponseEvent(Packet &pkt, MemoryPort *memoryPort);
84        void process();
85        const char *description();
86    };
87
88  private:
89    // prevent copying of a MainMemory object
90    PhysicalMemory(const PhysicalMemory &specmem);
91    const PhysicalMemory &operator=(const PhysicalMemory &specmem);
92
93  protected:
94    Addr base_addr;
95    Addr pmem_size;
96    uint8_t *pmem_addr;
97    int page_ptr;
98
99  public:
100    Addr new_page();
101    uint64_t size() { return pmem_size; }
102
103  public:
104    PhysicalMemory(const std::string &n);
105    virtual ~PhysicalMemory();
106
107  public:
108    int deviceBlockSize();
109
110    // fast back-door memory access for vtophys(), remote gdb, etc.
111    // uint64_t phys_read_qword(Addr addr) const;
112  private:
113    bool doTimingAccess(Packet &pkt, MemoryPort *memoryPort);
114    Tick doAtomicAccess(Packet &pkt);
115    void doFunctionalAccess(Packet &pkt);
116
117    void recvStatusChange(Port::Status status);
118
119  public:
120    virtual void serialize(std::ostream &os);
121    virtual void unserialize(Checkpoint *cp, const std::string &section);
122};
123
124/*uint64_t
125PhysicalMemory::phys_read_qword(Addr addr) const
126{
127    if (addr + sizeof(uint64_t) > pmem_size)
128        return 0;
129
130    return *(uint64_t *)(pmem_addr + addr);
131}*/
132
133
134#endif //__PHYSICAL_MEMORY_HH__
135