simple_mem.hh revision 2413 
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/memory.hh"
37
38//
39// Functional model for a contiguous block of physical memory. (i.e. RAM)
40//
41class PhysicalMemory : public Memory
42{
43    class MemoryPort : public Port
44    {
45        PhysicalMemory *memory;
46
47      public:
48
49        MemoryPort(PhysicalMemory *_memory);
50
51      protected:
52
53        virtual bool recvTiming(Packet &pkt);
54
55        virtual Tick recvAtomic(Packet &pkt);
56
57        virtual void recvFunctional(Packet &pkt);
58
59        virtual void recvStatusChange(Status status);
60
61        virtual void getDeviceAddressRanges(AddrRangeList &range_list,
62                                            bool &owner);
63
64        virtual int deviceBlockSize();
65
66    };
67
68    MemoryPort memoryPort;
69
70    Port * PhysicalMemory::getPort(const char *if_name);
71
72    int lat;
73
74    //event to send response needs to be here
75
76  private:
77    // prevent copying of a MainMemory object
78    PhysicalMemory(const PhysicalMemory &specmem);
79    const PhysicalMemory &operator=(const PhysicalMemory &specmem);
80
81  protected:
82    Addr base_addr;
83    Addr pmem_size;
84    uint8_t *pmem_addr;
85    int page_ptr;
86
87  public:
88    Addr new_page();
89    uint64_t size() { return pmem_size; }
90
91  public:
92    PhysicalMemory(const std::string &n);
93    virtual ~PhysicalMemory();
94
95  protected:
96    // error handling for prot_* functions
97    void prot_access_error(Addr addr, int size, const std::string &func);
98
99  public:
100    virtual int deviceBlockSize();
101
102    // Read/Write arbitrary amounts of data to simulated memory space
103    void prot_read(Addr addr, uint8_t *p, int size);
104    void prot_write(Addr addr, const uint8_t *p, int size);
105    void prot_memset(Addr addr, uint8_t val, int size);
106
107    // fast back-door memory access for vtophys(), remote gdb, etc.
108    uint64_t phys_read_qword(Addr addr) const;
109  private:
110    bool doTimingAccess(Packet &pkt);
111    Tick doAtomicAccess(Packet &pkt);
112    void doFunctionalAccess(Packet &pkt);
113
114    void recvStatusChange(Port::Status status);
115
116  public:
117    virtual void serialize(std::ostream &os);
118    virtual void unserialize(Checkpoint *cp, const std::string &section);
119};
120
121/*uint64_t
122PhysicalMemory::phys_read_qword(Addr addr) const
123{
124    if (addr + sizeof(uint64_t) > pmem_size)
125        return 0;
126
127    return *(uint64_t *)(pmem_addr + addr);
128}*/
129
130
131#endif //__PHYSICAL_MEMORY_HH__
132