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/*
* Copyright (c) 2006 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Ali Saidi
*/
/** @file
* This device acts as a disk similar to the memory mapped disk device
* in legion. Any access is translated to an offset in the disk image.
*/
#include <cstring>
#include "base/trace.hh"
#include "dev/sparc/mm_disk.hh"
#include "dev/platform.hh"
#include "mem/port.hh"
#include "mem/packet_access.hh"
#include "sim/byteswap.hh"
#include "sim/system.hh"
MmDisk::MmDisk(const Params *p)
: BasicPioDevice(p), image(p->image), curSector((off_t)-1), dirty(false)
{
std::memset(&diskData, 0, SectorSize);
pioSize = image->size() * SectorSize;
}
Tick
MmDisk::read(PacketPtr pkt)
{
Addr accessAddr;
off_t sector;
off_t bytes_read;
uint16_t d16;
uint32_t d32;
uint64_t d64;
assert(pkt->result == Packet::Unknown);
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
accessAddr = pkt->getAddr() - pioAddr;
sector = accessAddr / SectorSize;
if (sector != curSector) {
if (dirty) {
bytes_read = image->write(diskData, curSector);
assert(bytes_read == SectorSize);
}
bytes_read = image->read(diskData, sector);
assert(bytes_read == SectorSize);
curSector = sector;
}
switch (pkt->getSize()) {
case sizeof(uint8_t):
pkt->set(diskData[accessAddr % SectorSize]);
DPRINTF(IdeDisk, "reading byte %#x value= %#x\n", accessAddr, diskData[accessAddr %
SectorSize]);
break;
case sizeof(uint16_t):
memcpy(&d16, diskData + (accessAddr % SectorSize), 2);
pkt->set(htobe(d32));
DPRINTF(IdeDisk, "reading word %#x value= %#x\n", accessAddr, d16);
break;
case sizeof(uint32_t):
memcpy(&d32, diskData + (accessAddr % SectorSize), 4);
pkt->set(htobe(d32));
DPRINTF(IdeDisk, "reading dword %#x value= %#x\n", accessAddr, d32);
break;
case sizeof(uint64_t):
memcpy(&d64, diskData + (accessAddr % SectorSize), 8);
pkt->set(htobe(d64));
DPRINTF(IdeDisk, "reading qword %#x value= %#x\n", accessAddr, d64);
break;
default:
panic("Invalid access size\n");
}
pkt->result = Packet::Success;
return pioDelay;
}
Tick
MmDisk::write(PacketPtr pkt)
{
Addr accessAddr;
off_t sector;
off_t bytes_read;
uint16_t d16;
uint32_t d32;
uint64_t d64;
assert(pkt->result == Packet::Unknown);
assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize);
accessAddr = pkt->getAddr() - pioAddr;
sector = accessAddr / SectorSize;
if (sector != curSector) {
if (dirty) {
bytes_read = image->write(diskData, curSector);
assert(bytes_read == SectorSize);
}
bytes_read = image->read(diskData, sector);
assert(bytes_read == SectorSize);
curSector = sector;
}
dirty = true;
switch (pkt->getSize()) {
case sizeof(uint8_t):
diskData[accessAddr % SectorSize] = htobe(pkt->get<uint8_t>());
DPRINTF(IdeDisk, "writing byte %#x value= %#x\n", accessAddr, diskData[accessAddr %
SectorSize]);
break;
case sizeof(uint16_t):
d16 = htobe(pkt->get<uint16_t>());
memcpy(diskData + (accessAddr % SectorSize), &d16, 2);
DPRINTF(IdeDisk, "writing word %#x value= %#x\n", accessAddr, d16);
break;
case sizeof(uint32_t):
d32 = htobe(pkt->get<uint32_t>());
memcpy(diskData + (accessAddr % SectorSize), &d32, 4);
DPRINTF(IdeDisk, "writing dword %#x value= %#x\n", accessAddr, d32);
break;
case sizeof(uint64_t):
d64 = htobe(pkt->get<uint64_t>());
memcpy(diskData + (accessAddr % SectorSize), &d64, 8);
DPRINTF(IdeDisk, "writing qword %#x value= %#x\n", accessAddr, d64);
break;
default:
panic("Invalid access size\n");
}
pkt->result = Packet::Success;
return pioDelay;
}
void
MmDisk::serialize(std::ostream &os)
{
// just write any dirty changes to the cow layer it will take care of
// serialization
int bytes_read;
if (dirty) {
bytes_read = image->write(diskData, curSector);
assert(bytes_read == SectorSize);
}
}
MmDisk *
MmDiskParams::create()
{
return new MmDisk(this);
}
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