physical.hh revision 2415 
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#include "mem/packet.hh"
38#include "mem/port.hh"
39#include "sim/eventq.hh"
40
41//
42// Functional model for a contiguous block of physical memory. (i.e. RAM)
43//
44class PhysicalMemory : public Memory
45{
46    class MemoryPort : public Port
47    {
48        PhysicalMemory *memory;
49
50      public:
51
52        MemoryPort(PhysicalMemory *_memory);
53
54      protected:
55
56        virtual bool recvTiming(Packet &pkt);
57
58        virtual Tick recvAtomic(Packet &pkt);
59
60        virtual void recvFunctional(Packet &pkt);
61
62        virtual void recvStatusChange(Status status);
63
64        virtual void getDeviceAddressRanges(AddrRangeList &range_list,
65                                            bool &owner);
66
67        virtual int deviceBlockSize();
68    };
69
70    MemoryPort memoryPort;
71
72    Port * PhysicalMemory::getPort(const char *if_name);
73
74    int lat;
75
76    struct MemResponseEvent : public Event
77    {
78        Packet pkt;
79        MemoryPort *memoryPort;
80
81        MemResponseEvent(Packet &pkt, MemoryPort *memoryPort);
82        void process();
83        const char *description();
84    };
85
86  private:
87    // prevent copying of a MainMemory object
88    PhysicalMemory(const PhysicalMemory &specmem);
89    const PhysicalMemory &operator=(const PhysicalMemory &specmem);
90
91  protected:
92    Addr base_addr;
93    Addr pmem_size;
94    uint8_t *pmem_addr;
95    int page_ptr;
96
97  public:
98    Addr new_page();
99    uint64_t size() { return pmem_size; }
100
101  public:
102    PhysicalMemory(const std::string &n);
103    virtual ~PhysicalMemory();
104
105  protected:
106    // error handling for prot_* functions
107    void prot_access_error(Addr addr, int size, Command func);
108
109  public:
110    int deviceBlockSize();
111
112    void prot_memset(Addr addr, uint8_t val, int size);
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);
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/*uint64_t
129PhysicalMemory::phys_read_qword(Addr addr) const
130{
131    if (addr + sizeof(uint64_t) > pmem_size)
132        return 0;
133
134    return *(uint64_t *)(pmem_addr + addr);
135}*/
136
137
138#endif //__PHYSICAL_MEMORY_HH__
139