2 * Copyright (c) 2006 The Regents of The University of Michigan
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.
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.
32 * This device acts as a disk similar to the memory mapped disk device
33 * in legion. Any access is translated to an offset in the disk image.
38 #include "base/trace.hh"
39 #include "dev/sparc/mm_disk.hh"
40 #include "dev/platform.hh"
41 #include "mem/port.hh"
42 #include "mem/packet_access.hh"
43 #include "sim/byteswap.hh"
44 #include "sim/system.hh"
46 MmDisk::MmDisk(const Params
*p
)
47 : BasicPioDevice(p
), image(p
->image
), curSector((off_t
)-1), dirty(false)
49 std::memset(&diskData
, 0, SectorSize
);
50 pioSize
= image
->size() * SectorSize
;
54 MmDisk::read(PacketPtr pkt
)
63 assert(pkt
->getAddr() >= pioAddr
&& pkt
->getAddr() < pioAddr
+ pioSize
);
64 accessAddr
= pkt
->getAddr() - pioAddr
;
66 sector
= accessAddr
/ SectorSize
;
68 if (sector
!= curSector
) {
70 bytes_read
= image
->write(diskData
, curSector
);
71 assert(bytes_read
== SectorSize
);
73 bytes_read
= image
->read(diskData
, sector
);
74 assert(bytes_read
== SectorSize
);
77 switch (pkt
->getSize()) {
79 pkt
->set(diskData
[accessAddr
% SectorSize
]);
80 DPRINTF(IdeDisk
, "reading byte %#x value= %#x\n", accessAddr
, diskData
[accessAddr
%
83 case sizeof(uint16_t):
84 memcpy(&d16
, diskData
+ (accessAddr
% SectorSize
), 2);
86 DPRINTF(IdeDisk
, "reading word %#x value= %#x\n", accessAddr
, d16
);
88 case sizeof(uint32_t):
89 memcpy(&d32
, diskData
+ (accessAddr
% SectorSize
), 4);
91 DPRINTF(IdeDisk
, "reading dword %#x value= %#x\n", accessAddr
, d32
);
93 case sizeof(uint64_t):
94 memcpy(&d64
, diskData
+ (accessAddr
% SectorSize
), 8);
96 DPRINTF(IdeDisk
, "reading qword %#x value= %#x\n", accessAddr
, d64
);
99 panic("Invalid access size\n");
102 pkt
->makeAtomicResponse();
107 MmDisk::write(PacketPtr pkt
)
116 assert(pkt
->getAddr() >= pioAddr
&& pkt
->getAddr() < pioAddr
+ pioSize
);
117 accessAddr
= pkt
->getAddr() - pioAddr
;
119 sector
= accessAddr
/ SectorSize
;
121 if (sector
!= curSector
) {
123 bytes_read
= image
->write(diskData
, curSector
);
124 assert(bytes_read
== SectorSize
);
126 bytes_read
= image
->read(diskData
, sector
);
127 assert(bytes_read
== SectorSize
);
132 switch (pkt
->getSize()) {
133 case sizeof(uint8_t):
134 diskData
[accessAddr
% SectorSize
] = htobe(pkt
->get
<uint8_t>());
135 DPRINTF(IdeDisk
, "writing byte %#x value= %#x\n", accessAddr
, diskData
[accessAddr
%
138 case sizeof(uint16_t):
139 d16
= htobe(pkt
->get
<uint16_t>());
140 memcpy(diskData
+ (accessAddr
% SectorSize
), &d16
, 2);
141 DPRINTF(IdeDisk
, "writing word %#x value= %#x\n", accessAddr
, d16
);
143 case sizeof(uint32_t):
144 d32
= htobe(pkt
->get
<uint32_t>());
145 memcpy(diskData
+ (accessAddr
% SectorSize
), &d32
, 4);
146 DPRINTF(IdeDisk
, "writing dword %#x value= %#x\n", accessAddr
, d32
);
148 case sizeof(uint64_t):
149 d64
= htobe(pkt
->get
<uint64_t>());
150 memcpy(diskData
+ (accessAddr
% SectorSize
), &d64
, 8);
151 DPRINTF(IdeDisk
, "writing qword %#x value= %#x\n", accessAddr
, d64
);
154 panic("Invalid access size\n");
157 pkt
->makeAtomicResponse();
162 MmDisk::serialize(std::ostream
&os
)
164 // just write any dirty changes to the cow layer it will take care of
168 bytes_read
= image
->write(diskData
, curSector
);
169 assert(bytes_read
== SectorSize
);
174 MmDiskParams::create()
176 return new MmDisk(this);