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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 "base/trace.hh"
#include "dev/sparc/mm_disk.hh"
#include "dev/platform.hh"
#include "mem/port.hh"
#include "mem/packet_access.hh"
#include "sim/builder.hh"
#include "sim/byteswap.hh"
#include "sim/system.hh"
MmDisk::MmDisk(Params *p)
: BasicPioDevice(p), image(p->image), curSector((uint64_t)-1), dirty(false)
{
memset(&bytes, 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(bytes, curSector);
bytes_read = image->read(bytes, sector);
curSector = sector;
}
switch (pkt->getSize()) {
case sizeof(uint8_t):
pkt->set(bytes[accessAddr % SectorSize]);
break;
case sizeof(uint16_t):
d16 = (uint16_t*)bytes + (accessAddr % SectorSize)/2;
pkt->set(htobe(*d16));
break;
case sizeof(uint32_t):
d32 = (uint32_t*)bytes + (accessAddr % SectorSize)/4;
pkt->set(htobe(*d32));
break;
case sizeof(uint64_t):
d64 = (uint64_t*)bytes + (accessAddr % SectorSize)/8;
pkt->set(htobe(*d64));
break;
default:
panic("Invalid access size\n");
}
pkt->result = Packet::Success;
return pioDelay;
}
Tick
MmDisk::write(PacketPtr pkt)
{
panic("need to implement\n");
}
BEGIN_DECLARE_SIM_OBJECT_PARAMS(MmDisk)
Param<Addr> pio_addr;
Param<Tick> pio_latency;
Param<Addr> pio_size;
SimObjectParam<Platform *> platform;
SimObjectParam<System *> system;
SimObjectParam<DiskImage *> image;
END_DECLARE_SIM_OBJECT_PARAMS(MmDisk)
BEGIN_INIT_SIM_OBJECT_PARAMS(MmDisk)
INIT_PARAM(pio_addr, "Device Address"),
INIT_PARAM(pio_latency, "Programmed IO latency"),
INIT_PARAM(pio_size, "Size of address range"),
INIT_PARAM(platform, "platform"),
INIT_PARAM(system, "system object"),
INIT_PARAM(image, "disk image")
END_INIT_SIM_OBJECT_PARAMS(MmDisk)
CREATE_SIM_OBJECT(MmDisk)
{
MmDisk::Params *p = new MmDisk::Params;
p->name = getInstanceName();
p->pio_addr = pio_addr;
p->pio_delay = pio_latency;
p->platform = platform;
p->system = system;
p->image = image;
return new MmDisk(p);
}
REGISTER_SIM_OBJECT("MmDisk", MmDisk)
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