i8254.cc revision 10642
110448Snilay@cs.wisc.edu/*
210448Snilay@cs.wisc.edu * Copyright (c) 2008 The Regents of The University of Michigan
310448Snilay@cs.wisc.edu * All rights reserved.
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610448Snilay@cs.wisc.edu * modification, are permitted provided that the following conditions are
710448Snilay@cs.wisc.edu * met: redistributions of source code must retain the above copyright
810448Snilay@cs.wisc.edu * notice, this list of conditions and the following disclaimer;
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1010448Snilay@cs.wisc.edu * notice, this list of conditions and the following disclaimer in the
1110448Snilay@cs.wisc.edu * documentation and/or other materials provided with the distribution;
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1410448Snilay@cs.wisc.edu * this software without specific prior written permission.
1510448Snilay@cs.wisc.edu *
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1910448Snilay@cs.wisc.edu * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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2510447Snilay@cs.wisc.edu * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
2610447Snilay@cs.wisc.edu * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
2710447Snilay@cs.wisc.edu *
2810447Snilay@cs.wisc.edu * Authors: Gabe Black
2910447Snilay@cs.wisc.edu */
3010447Snilay@cs.wisc.edu
3110447Snilay@cs.wisc.edu#include "debug/I8254.hh"
3210447Snilay@cs.wisc.edu#include "dev/x86/i8254.hh"
3310447Snilay@cs.wisc.edu#include "dev/x86/intdev.hh"
3410447Snilay@cs.wisc.edu#include "mem/packet.hh"
3510447Snilay@cs.wisc.edu#include "mem/packet_access.hh"
3610447Snilay@cs.wisc.edu
3710447Snilay@cs.wisc.eduvoid
3810447Snilay@cs.wisc.eduX86ISA::I8254::counterInterrupt(unsigned int num)
3910447Snilay@cs.wisc.edu{
4010447Snilay@cs.wisc.edu    DPRINTF(I8254, "Interrupt from counter %d.\n", num);
4110447Snilay@cs.wisc.edu    if (num == 0) {
4210447Snilay@cs.wisc.edu        intPin->raise();
4310447Snilay@cs.wisc.edu        //XXX This is a hack.
4410447Snilay@cs.wisc.edu        intPin->lower();
4510447Snilay@cs.wisc.edu    }
4610447Snilay@cs.wisc.edu}
4710447Snilay@cs.wisc.edu
4810447Snilay@cs.wisc.eduTick
4910447Snilay@cs.wisc.eduX86ISA::I8254::read(PacketPtr pkt)
5010447Snilay@cs.wisc.edu{
5110447Snilay@cs.wisc.edu    assert(pkt->getSize() == 1);
5210447Snilay@cs.wisc.edu    Addr offset = pkt->getAddr() - pioAddr;
5310447Snilay@cs.wisc.edu    if (offset < 3) {
5410447Snilay@cs.wisc.edu        pkt->set(pit.readCounter(offset));
5510447Snilay@cs.wisc.edu    } else if (offset == 3) {
56        pkt->set(uint8_t(-1));
57    } else {
58        panic("Read from undefined i8254 register.\n");
59    }
60    pkt->makeAtomicResponse();
61    return latency;
62}
63
64Tick
65X86ISA::I8254::write(PacketPtr pkt)
66{
67    assert(pkt->getSize() == 1);
68    Addr offset = pkt->getAddr() - pioAddr;
69    if (offset < 3) {
70        pit.writeCounter(offset, pkt->get<uint8_t>());
71    } else if (offset == 3) {
72        pit.writeControl(pkt->get<uint8_t>());
73    } else {
74        panic("Write to undefined i8254 register.\n");
75    }
76    pkt->makeAtomicResponse();
77    return latency;
78}
79
80void
81X86ISA::I8254::serialize(std::ostream &os)
82{
83    pit.serialize("pit", os);
84}
85
86void
87X86ISA::I8254::unserialize(Checkpoint *cp, const std::string &section)
88{
89    pit.unserialize("pit", cp, section);
90}
91
92void
93X86ISA::I8254::startup()
94{
95    pit.startup();
96}
97
98X86ISA::I8254 *
99I8254Params::create()
100{
101    return new X86ISA::I8254(this);
102}
103