addr_mapper.hh revision 13784 
1/*
2 * Copyright (c) 2012 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Andreas Hansson
38 */
39
40#ifndef __MEM_ADDR_MAPPER_HH__
41#define __MEM_ADDR_MAPPER_HH__
42
43#include "mem/mem_object.hh"
44#include "params/AddrMapper.hh"
45#include "params/RangeAddrMapper.hh"
46
47/**
48 * An address mapper changes the packet addresses in going from the
49 * slave port side of the mapper to the master port side. When the
50 * slave port is queried for the address ranges, it also performs the
51 * necessary range updates. Note that snoop requests that travel from
52 * the master port (i.e. the memory side) to the slave port are
53 * currently not modified.
54 */
55
56class AddrMapper : public MemObject
57{
58
59  public:
60
61    AddrMapper(const AddrMapperParams* params);
62
63    virtual ~AddrMapper() { }
64
65    Port &getPort(const std::string &if_name,
66                  PortID idx=InvalidPortID) override;
67
68    virtual void init();
69
70  protected:
71
72    /**
73     * This function does the actual remapping of one address to another.
74     * It is pure virtual in this case to to allow any implementation
75     * required.
76     * @param addr the address to remap
77     * @return the new address (can be unchanged)
78     */
79    virtual Addr remapAddr(Addr addr) const = 0;
80
81    class AddrMapperSenderState : public Packet::SenderState
82    {
83
84      public:
85
86        /**
87         * Construct a new sender state to remember the original address.
88         *
89         * @param _origAddr Address before remapping
90         */
91        AddrMapperSenderState(Addr _origAddr) : origAddr(_origAddr)
92        { }
93
94        /** Destructor */
95        ~AddrMapperSenderState() { }
96
97        /** The original address the packet was destined for */
98        Addr origAddr;
99
100    };
101
102    class MapperMasterPort : public MasterPort
103    {
104
105      public:
106
107        MapperMasterPort(const std::string& _name, AddrMapper& _mapper)
108            : MasterPort(_name, &_mapper), mapper(_mapper)
109        { }
110
111      protected:
112
113        void recvFunctionalSnoop(PacketPtr pkt)
114        {
115            mapper.recvFunctionalSnoop(pkt);
116        }
117
118        Tick recvAtomicSnoop(PacketPtr pkt)
119        {
120            return mapper.recvAtomicSnoop(pkt);
121        }
122
123        bool recvTimingResp(PacketPtr pkt)
124        {
125            return mapper.recvTimingResp(pkt);
126        }
127
128        void recvTimingSnoopReq(PacketPtr pkt)
129        {
130            mapper.recvTimingSnoopReq(pkt);
131        }
132
133        void recvRangeChange()
134        {
135            mapper.recvRangeChange();
136        }
137
138        bool isSnooping() const
139        {
140            return mapper.isSnooping();
141        }
142
143        void recvReqRetry()
144        {
145            mapper.recvReqRetry();
146        }
147
148      private:
149
150        AddrMapper& mapper;
151
152    };
153
154    /** Instance of master port, facing the memory side */
155    MapperMasterPort masterPort;
156
157    class MapperSlavePort : public SlavePort
158    {
159
160      public:
161
162        MapperSlavePort(const std::string& _name, AddrMapper& _mapper)
163            : SlavePort(_name, &_mapper), mapper(_mapper)
164        { }
165
166      protected:
167
168        void recvFunctional(PacketPtr pkt)
169        {
170            mapper.recvFunctional(pkt);
171        }
172
173        Tick recvAtomic(PacketPtr pkt)
174        {
175            return mapper.recvAtomic(pkt);
176        }
177
178        bool recvTimingReq(PacketPtr pkt)
179        {
180            return mapper.recvTimingReq(pkt);
181        }
182
183        bool recvTimingSnoopResp(PacketPtr pkt)
184        {
185            return mapper.recvTimingSnoopResp(pkt);
186        }
187
188        AddrRangeList getAddrRanges() const
189        {
190            return mapper.getAddrRanges();
191        }
192
193        void recvRespRetry()
194        {
195            mapper.recvRespRetry();
196        }
197
198      private:
199
200        AddrMapper& mapper;
201
202    };
203
204    /** Instance of slave port, i.e. on the CPU side */
205    MapperSlavePort slavePort;
206
207    void recvFunctional(PacketPtr pkt);
208
209    void recvFunctionalSnoop(PacketPtr pkt);
210
211    Tick recvAtomic(PacketPtr pkt);
212
213    Tick recvAtomicSnoop(PacketPtr pkt);
214
215    bool recvTimingReq(PacketPtr pkt);
216
217    bool recvTimingResp(PacketPtr pkt);
218
219    void recvTimingSnoopReq(PacketPtr pkt);
220
221    bool recvTimingSnoopResp(PacketPtr pkt);
222
223    virtual AddrRangeList getAddrRanges() const = 0;
224
225    bool isSnooping() const;
226
227    void recvReqRetry();
228
229    void recvRespRetry();
230
231    void recvRangeChange();
232};
233
234/**
235 * Range address mapper that maps a set of original ranges to a set of
236 * remapped ranges, where a specific range is of the same size
237 * (original and remapped), only with an offset. It's useful for cases
238 * where memory is mapped to two different locations
239 */
240class RangeAddrMapper : public AddrMapper
241{
242
243  public:
244
245    RangeAddrMapper(const RangeAddrMapperParams* p);
246
247    ~RangeAddrMapper() { }
248
249    AddrRangeList getAddrRanges() const;
250
251  protected:
252
253    /**
254     * This contains a list of ranges the should be remapped. It must
255     * be the exact same length as remappedRanges which describes what
256     * manipulation should be done to each range.
257     */
258    std::vector<AddrRange> originalRanges;
259
260    /**
261     * This contains a list of ranges that addresses should be
262     * remapped to. See the description for originalRanges above
263     */
264    std::vector<AddrRange> remappedRanges;
265
266    Addr remapAddr(Addr addr) const;
267
268};
269
270#endif //__MEM_ADDR_MAPPER_HH__
271