port_proxy.hh revision 14011 
1/*
2 * Copyright (c) 2011-2013, 2018 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
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9 * licensed hereunder.  You may use the software subject to the license
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13 *
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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;
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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
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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
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35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Andreas Hansson
38 */
39
40/**
41 * @file
42 * PortProxy Object Declaration.
43 *
44 * Port proxies are used when non-structural entities need access to
45 * the memory system (or structural entities that want to peak into
46 * the memory system without making a real memory access).
47 *
48 * Proxy objects replace the previous FunctionalPort, TranslatingPort
49 * and VirtualPort objects, which provided the same functionality as
50 * the proxies, but were instances of ports not corresponding to real
51 * structural ports of the simulated system. Via the port proxies all
52 * the accesses go through an actual port (either the system port,
53 * e.g. for processes or initialisation, or a the data port of the
54 * CPU, e.g. for threads) and thus are transparent to a potentially
55 * distributed memory and automatically adhere to the memory map of
56 * the system.
57 */
58
59#ifndef __MEM_PORT_PROXY_HH__
60#define __MEM_PORT_PROXY_HH__
61
62#include "mem/port.hh"
63#include "sim/byteswap.hh"
64
65/**
66 * This object is a proxy for a structural port, to be used for debug
67 * accesses.
68 *
69 * This proxy object is used when non structural entities
70 * (e.g. thread contexts, object file loaders) need access to the
71 * memory system. It calls the corresponding functions on the underlying
72 * structural port, and provides templatized convenience access functions.
73 *
74 * The addresses are interpreted as physical addresses.
75 *
76 * @sa SETranslatingProxy
77 * @sa FSTranslatingProxy
78 */
79class PortProxy
80{
81  private:
82
83    /** The actual physical port used by this proxy. */
84    MasterPort &_port;
85
86    /** Granularity of any transactions issued through this proxy. */
87    const unsigned int _cacheLineSize;
88
89  public:
90    PortProxy(MasterPort &port, unsigned int cacheLineSize) :
91        _port(port), _cacheLineSize(cacheLineSize)
92    {}
93    virtual ~PortProxy() { }
94
95
96
97    /** Fixed functionality for use in base classes. */
98
99    /**
100     * Read size bytes memory at physical address and store in p.
101     */
102    void readBlobPhys(Addr addr, Request::Flags flags,
103                      void *p, int size) const;
104
105    /**
106     * Write size bytes from p to physical address.
107     */
108    void writeBlobPhys(Addr addr, Request::Flags flags,
109                       const void *p, int size) const;
110
111    /**
112     * Fill size bytes starting at physical addr with byte value val.
113     */
114    void memsetBlobPhys(Addr addr, Request::Flags flags,
115                        uint8_t v, int size) const;
116
117
118
119    /** Methods to override in base classes */
120
121    /**
122     * Read size bytes memory at address and store in p.
123     * Returns true on success and false on failure.
124     */
125    virtual bool
126    tryReadBlob(Addr addr, void *p, int size) const
127    {
128        readBlobPhys(addr, 0, p, size);
129        return true;
130    }
131
132    /**
133     * Write size bytes from p to address.
134     * Returns true on success and false on failure.
135     */
136    virtual bool
137    tryWriteBlob(Addr addr, const void *p, int size) const
138    {
139        writeBlobPhys(addr, 0, p, size);
140        return true;
141    }
142
143    /**
144     * Fill size bytes starting at addr with byte value val.
145     * Returns true on success and false on failure.
146     */
147    virtual bool
148    tryMemsetBlob(Addr addr, uint8_t val, int size) const
149    {
150        memsetBlobPhys(addr, 0, val, size);
151        return true;
152    }
153
154
155
156    /** Higher level interfaces based on the above. */
157
158    /**
159     * Same as tryReadBlob, but insists on success.
160     */
161    void
162    readBlob(Addr addr, void *p, int size) const
163    {
164        if (!tryReadBlob(addr, p, size))
165            fatal("readBlob(%#x, ...) failed", addr);
166    }
167
168    /**
169     * Same as tryWriteBlob, but insists on success.
170     */
171    void
172    writeBlob(Addr addr, const void *p, int size) const
173    {
174        if (!tryWriteBlob(addr, p, size))
175            fatal("writeBlob(%#x, ...) failed", addr);
176    }
177
178    /**
179     * Same as tryMemsetBlob, but insists on success.
180     */
181    void
182    memsetBlob(Addr addr, uint8_t v, int size) const
183    {
184        if (!tryMemsetBlob(addr, v, size))
185            fatal("memsetBlob(%#x, ...) failed", addr);
186    }
187
188    /**
189     * Read sizeof(T) bytes from address and return as object T.
190     */
191    template <typename T>
192    T read(Addr address) const;
193
194    /**
195     * Write object T to address. Writes sizeof(T) bytes.
196     */
197    template <typename T>
198    void write(Addr address, const T &data) const;
199
200    /**
201     * Read sizeof(T) bytes from address and return as object T.
202     * Performs endianness conversion from the selected guest to host order.
203     */
204    template <typename T>
205    T read(Addr address, ByteOrder guest_byte_order) const;
206
207    /**
208     * Write object T to address. Writes sizeof(T) bytes.
209     * Performs endianness conversion from host to the selected guest order.
210     */
211    template <typename T>
212    void write(Addr address, T data, ByteOrder guest_byte_order) const;
213
214    /**
215     * Write the string str into guest memory at address addr.
216     * Returns true on success and false on failure.
217     */
218    bool tryWriteString(Addr addr, const char *str) const;
219
220    /**
221     * Same as tryWriteString, but insists on success.
222     */
223    void
224    writeString(Addr addr, const char *str) const
225    {
226        if (!tryWriteString(addr, str))
227            fatal("writeString(%#x, ...) failed", addr);
228    }
229
230    /**
231     * Reads the string at guest address addr into the std::string str.
232     * Returns true on success and false on failure.
233     */
234    bool tryReadString(std::string &str, Addr addr) const;
235
236    /**
237     * Same as tryReadString, but insists on success.
238     */
239    void
240    readString(std::string &str, Addr addr) const
241    {
242        if (!tryReadString(str, addr))
243            fatal("readString(%#x, ...) failed", addr);
244    }
245};
246
247
248template <typename T>
249T
250PortProxy::read(Addr address) const
251{
252    T data;
253    readBlob(address, &data, sizeof(T));
254    return data;
255}
256
257template <typename T>
258void
259PortProxy::write(Addr address, const T &data) const
260{
261    writeBlob(address, &data, sizeof(T));
262}
263
264template <typename T>
265T
266PortProxy::read(Addr address, ByteOrder byte_order) const
267{
268    T data;
269    readBlob(address, &data, sizeof(T));
270    return gtoh(data, byte_order);
271}
272
273template <typename T>
274void
275PortProxy::write(Addr address, T data, ByteOrder byte_order) const
276{
277    data = htog(data, byte_order);
278    writeBlob(address, &data, sizeof(T));
279}
280
281#endif // __MEM_PORT_PROXY_HH__
282