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/*
* Copyright (c) 2008 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: Gabe Black
*/
#include "dev/x86/i8254.hh"
#include "mem/packet.hh"
#include "mem/packet_access.hh"
Tick
X86ISA::I8254::read(PacketPtr pkt)
{
assert(pkt->getSize() == 1);
Addr offset = pkt->getAddr() - pioAddr;
if (offset < 3) {
pkt->set(pit.readCounter(offset));
} else if (offset == 3) {
pkt->set(uint8_t(-1));
} else {
panic("Read from undefined i8254 register.\n");
}
return latency;
}
Tick
X86ISA::I8254::write(PacketPtr pkt)
{
assert(pkt->getSize() == 1);
Addr offset = pkt->getAddr() - pioAddr;
if (offset < 3) {
pit.writeCounter(offset, pkt->get<uint8_t>());
} else if (offset == 3) {
pit.writeControl(pkt->get<uint8_t>());
} else {
panic("Write to undefined i8254 register.\n");
}
return latency;
}
X86ISA::I8254 *
I8254Params::create()
{
return new X86ISA::I8254(this);
}
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