amba_fake.cc revision 8245:a9d06c894afe 
1/*
2 * Copyright (c) 2010 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 * Copyright (c) 2005 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Ali Saidi
41 */
42
43#include "base/trace.hh"
44#include "debug/AMBA.hh"
45#include "dev/arm/amba_fake.hh"
46#include "mem/packet.hh"
47#include "mem/packet_access.hh"
48
49using namespace AmbaDev;
50
51AmbaFake::AmbaFake(const Params *p)
52    : AmbaDevice(p)
53{
54    pioSize = 0xfff;
55}
56
57Tick
58AmbaFake::read(PacketPtr pkt)
59{
60    assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
61
62    Addr daddr = pkt->getAddr() - pioAddr;
63    pkt->allocate();
64
65    DPRINTF(AMBA, " read register %#x\n", daddr);
66
67    pkt->set<uint32_t>(0);
68    if (!readId(pkt, ambaId, pioAddr) && !params()->ignore_access)
69        panic("Tried to read AmbaFake at offset %#x that doesn't exist\n", daddr);
70
71    pkt->makeAtomicResponse();
72    return pioDelay;
73}
74
75Tick
76AmbaFake::write(PacketPtr pkt)
77{
78
79    Addr daddr = pkt->getAddr() - pioAddr;
80    pkt->allocate();
81
82    if (!params()->ignore_access)
83        panic("Tried to write AmbaFake at offset %#x that doesn't exist\n", daddr);
84
85    pkt->makeAtomicResponse();
86    return pioDelay;
87}
88
89
90AmbaFake *
91AmbaFakeParams::create()
92{
93    return new AmbaFake(this);
94}
95