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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 "base/bitunion.hh"
#include "base/trace.hh"
#include "dev/x86/south_bridge/i8254.hh"
#include "dev/x86/south_bridge/speaker.hh"
#include "mem/packet_access.hh"
Tick
X86ISA::Speaker::read(PacketPtr pkt)
{
assert(pkt->getAddr() == addrRange.start);
assert(pkt->getSize() == 1);
controlVal.timer = timer->pit.outputHigh(2) ? 1 : 0;
DPRINTF(PCSpeaker,
"Reading from speaker device: gate %s, speaker %s, output %s.\n",
controlVal.gate ? "on" : "off",
controlVal.speaker ? "on" : "off",
controlVal.timer ? "on" : "off");
pkt->set((uint8_t)controlVal);
return latency;
}
Tick
X86ISA::Speaker::write(PacketPtr pkt)
{
assert(pkt->getAddr() == addrRange.start);
assert(pkt->getSize() == 1);
SpeakerControl val = pkt->get<uint8_t>();
controlVal.gate = val.gate;
//Change the gate value in the timer.
if (!val.gate)
warn("The gate bit of the pc speaker isn't implemented and "
"is always on.\n");
//This would control whether the timer output is hooked up to a physical
//speaker. Since M5 can't make noise, it's value doesn't actually do
//anything.
controlVal.speaker = val.speaker;
DPRINTF(PCSpeaker, "Writing to speaker device: gate %s, speaker %s.\n",
controlVal.gate ? "on" : "off", controlVal.speaker ? "on" : "off");
return latency;
}
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