gem5 [DEVELOP-FOR-25.1]
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amba_fake.cc
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1/*
2 * Copyright (c) 2010, 2019 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
41#include "dev/arm/amba_fake.hh"
42
43#include "base/trace.hh"
44#include "debug/AMBA.hh"
45#include "mem/packet.hh"
46#include "mem/packet_access.hh"
47#include "params/AmbaFake.hh"
48
49namespace gem5
50{
51
53 : AmbaPioDevice(p, 0x1000)
54{
55}
56
57Tick
59{
60 assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
61
62 Addr daddr = pkt->getAddr() - pioAddr;
63
64 DPRINTF(AMBA, " read register %#x\n", daddr);
65
66 pkt->setLE<uint32_t>(0);
67 if (!readId(pkt, ambaId, pioAddr) && !params().ignore_access)
68 panic("Tried to read AmbaFake %s at offset %#x that doesn't exist\n",
69 name(), daddr);
70
71 pkt->makeAtomicResponse();
72 return pioDelay;
73}
74
75Tick
77{
78
79 Addr daddr = pkt->getAddr() - pioAddr;
80
81 if (!params().ignore_access)
82 panic("Tried to write AmbaFake %s at offset %#x that doesn't exist\n",
83 name(), daddr);
84
85 pkt->makeAtomicResponse();
86 return pioDelay;
87}
88
89} // namespace gem5
This device sits in memory and reponds appropriately so the linux kernel ignores the device it is try...
#define DPRINTF(x,...)
Definition trace.hh:209
bool readId(PacketPtr pkt, uint64_t amba_id, Addr pio_addr)
virtual Tick write(PacketPtr pkt)
Pure virtual function that the device must implement.
Definition amba_fake.cc:76
virtual Tick read(PacketPtr pkt)
Pure virtual function that the device must implement.
Definition amba_fake.cc:58
AmbaFake(const Params &p)
Definition amba_fake.cc:52
AmbaPioDevice(const Params &p, Addr pio_size)
AmbaPioDeviceParams Params
Addr pioAddr
Address that the device listens to.
Definition io_device.hh:151
Tick pioDelay
Delay that the device experinces on an access.
Definition io_device.hh:157
Addr pioSize
Size that the device's address range.
Definition io_device.hh:154
Addr getAddr() const
Definition packet.hh:807
void setLE(T v)
Set the value in the data pointer to v as little endian.
void makeAtomicResponse()
Definition packet.hh:1074
#define panic(...)
This implements a cprintf based panic() function.
Definition logging.hh:220
const Params & params() const
Bitfield< 0 > p
Copyright (c) 2024 Arm Limited All rights reserved.
Definition binary32.hh:36
uint64_t Addr
Address type This will probably be moved somewhere else in the near future.
Definition types.hh:147
uint64_t Tick
Tick count type.
Definition types.hh:58
Packet * PacketPtr
Declaration of the Packet class.
const std::string & name()
Definition trace.cc:48

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