2 * Copyright (c) 2008 The Regents of The University of Michigan
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.
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.
31 #include "debug/I8254.hh"
32 #include "dev/x86/i8254.hh"
33 #include "dev/x86/intdev.hh"
34 #include "mem/packet.hh"
35 #include "mem/packet_access.hh"
38 X86ISA::I8254::counterInterrupt(unsigned int num
)
40 DPRINTF(I8254
, "Interrupt from counter %d.\n", num
);
49 X86ISA::I8254::read(PacketPtr pkt
)
51 assert(pkt
->getSize() == 1);
52 Addr offset
= pkt
->getAddr() - pioAddr
;
54 pkt
->set(pit
.readCounter(offset
));
55 } else if (offset
== 3) {
56 pkt
->set(uint8_t(-1));
58 panic("Read from undefined i8254 register.\n");
60 pkt
->makeAtomicResponse();
65 X86ISA::I8254::write(PacketPtr pkt
)
67 assert(pkt
->getSize() == 1);
68 Addr offset
= pkt
->getAddr() - pioAddr
;
70 pit
.writeCounter(offset
, pkt
->get
<uint8_t>());
71 } else if (offset
== 3) {
72 pit
.writeControl(pkt
->get
<uint8_t>());
74 panic("Write to undefined i8254 register.\n");
76 pkt
->makeAtomicResponse();
81 X86ISA::I8254::serialize(std::ostream
&os
)
83 pit
.serialize("pit", os
);
87 X86ISA::I8254::unserialize(Checkpoint
*cp
, const std::string
§ion
)
89 pit
.unserialize("pit", cp
, section
);
95 return new X86ISA::I8254(this);