abstract_mem.hh revision 2497 
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    MemoryPort memPort;
73
74    virtual Port * getPort(const char *if_name);
75
76    int numPorts;
77
78    int lat;
79
80    struct MemResponseEvent : public Event
81    {
82        Packet &pkt;
83        MemoryPort *memoryPort;
84
85        MemResponseEvent(Packet &pkt, MemoryPort *memoryPort);
86        void process();
87        const char *description();
88    };
89
90  private:
91    // prevent copying of a MainMemory object
92    PhysicalMemory(const PhysicalMemory &specmem);
93    const PhysicalMemory &operator=(const PhysicalMemory &specmem);
94
95  protected:
96    Addr base_addr;
97    Addr pmem_size;
98    uint8_t *pmem_addr;
99    int page_ptr;
100
101  public:
102    Addr new_page();
103    uint64_t size() { return pmem_size; }
104
105  public:
106    PhysicalMemory(const std::string &n, MemObject *bus);
107    virtual ~PhysicalMemory();
108
109  public:
110    int deviceBlockSize();
111    void getAddressRanges(AddrRangeList &rangeList, bool &owner);
112    void virtual init() { memPort.sendStatusChange(Port::RangeChange); }
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/*uint64_t
130PhysicalMemory::phys_read_qword(Addr addr) const
131{
132    if (addr + sizeof(uint64_t) > pmem_size)
133        return 0;
134
135    return *(uint64_t *)(pmem_addr + addr);
136}*/
137
138
139#endif //__PHYSICAL_MEMORY_HH__
140