speaker.cc revision 5445
1/* 2 * Copyright (c) 2008 The Regents of The University of Michigan 3 * All rights reserved. 4 * 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. 15 * 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. 27 * 28 * Authors: Gabe Black 29 */ 30 31#include "base/bitunion.hh" 32#include "base/trace.hh" 33#include "dev/x86/south_bridge/i8254.hh" 34#include "dev/x86/south_bridge/speaker.hh" 35#include "mem/packet_access.hh" 36 37Tick 38X86ISA::Speaker::read(PacketPtr pkt) 39{ 40 assert(pkt->getAddr() == addrRange.start); 41 assert(pkt->getSize() == 1); 42 controlVal.timer = timer->pit.counter2.outputHigh() ? 1 : 0; 43 DPRINTF(PCSpeaker, 44 "Reading from speaker device: gate %s, speaker %s, output %s.\n", 45 controlVal.gate ? "on" : "off", 46 controlVal.speaker ? "on" : "off", 47 controlVal.timer ? "on" : "off"); 48 pkt->set((uint8_t)controlVal); 49 return latency; 50} 51 52Tick 53X86ISA::Speaker::write(PacketPtr pkt) 54{ 55 assert(pkt->getAddr() == addrRange.start); 56 assert(pkt->getSize() == 1); 57 SpeakerControl val = pkt->get<uint8_t>(); 58 controlVal.gate = val.gate; 59 //Change the gate value in the timer. 60 if (!val.gate) 61 warn("The gate bit of the pc speaker isn't implemented and " 62 "is always on.\n"); 63 //This would control whether the timer output is hooked up to a physical 64 //speaker. Since M5 can't make noise, it's value doesn't actually do 65 //anything. 66 controlVal.speaker = val.speaker; 67 DPRINTF(PCSpeaker, "Writing to speaker device: gate %s, speaker %s.\n", 68 controlVal.gate ? "on" : "off", controlVal.speaker ? "on" : "off"); 69 return latency; 70} 71