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 "dev/x86/i8254.hh"
| 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 "dev/x86/i8254.hh"
|
35Tick
36X86ISA::I8254::read(PacketPtr pkt)
37{
38 assert(pkt->getSize() == 1);
39 Addr offset = pkt->getAddr() - pioAddr;
40 if (offset < 3) {
41 pkt->set(pit.readCounter(offset));
42 } else if (offset == 3) {
43 pkt->set(uint8_t(-1));
44 } else {
45 panic("Read from undefined i8254 register.\n");
46 }
47 return latency;
48}
49
50Tick
51X86ISA::I8254::write(PacketPtr pkt)
52{
53 assert(pkt->getSize() == 1);
54 Addr offset = pkt->getAddr() - pioAddr;
55 if (offset < 3) {
56 pit.writeCounter(offset, pkt->get<uint8_t>());
57 } else if (offset == 3) {
58 pit.writeControl(pkt->get<uint8_t>());
59 } else {
60 panic("Write to undefined i8254 register.\n");
61 }
62 return latency;
63}
64
65X86ISA::I8254 *
66I8254Params::create()
67{
68 return new X86ISA::I8254(this);
69}
| 44Tick
45X86ISA::I8254::read(PacketPtr pkt)
46{
47 assert(pkt->getSize() == 1);
48 Addr offset = pkt->getAddr() - pioAddr;
49 if (offset < 3) {
50 pkt->set(pit.readCounter(offset));
51 } else if (offset == 3) {
52 pkt->set(uint8_t(-1));
53 } else {
54 panic("Read from undefined i8254 register.\n");
55 }
56 return latency;
57}
58
59Tick
60X86ISA::I8254::write(PacketPtr pkt)
61{
62 assert(pkt->getSize() == 1);
63 Addr offset = pkt->getAddr() - pioAddr;
64 if (offset < 3) {
65 pit.writeCounter(offset, pkt->get<uint8_t>());
66 } else if (offset == 3) {
67 pit.writeControl(pkt->get<uint8_t>());
68 } else {
69 panic("Write to undefined i8254 register.\n");
70 }
71 return latency;
72}
73
74X86ISA::I8254 *
75I8254Params::create()
76{
77 return new X86ISA::I8254(this);
78}
|