1/*
2 * Copyright (c) 2014 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2003-2005 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright

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34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Nathan Binkert
41 * Ali Saidi
42 * Andreas Hansson
43 */
44
45#include <sstream>
46
47#include "base/misc.hh"
48#include "base/random.hh"
49#include "sim/serialize.hh"
50
51Random::Random()
52{
53 // default random seed
54 init(5489);
55}
56
57Random::Random(uint32_t s)
58{
59 init(s);
60}
61
62Random::~Random()
63{
64}
65
66void
67Random::init(uint32_t s)
68{
69 gen.seed(s);
70}
71
72void
73Random::serialize(std::ostream &os)
74{
75 panic("Currently not used anywhere.\n");
76
77 // get the state from the generator
78 std::ostringstream oss;
79 oss << gen;
80 std::string state = oss.str();
81 paramOut(os, "mt_state", state);
82}
83
84void
85Random::unserialize(Checkpoint *cp, const std::string &section)
86{
87 panic("Currently not used anywhere.\n");
88
89 // the random generator state did not use to be part of the
90 // checkpoint state, so be forgiving in the unserialization and
91 // keep on going if the parameter is not there
92 std::string state;
93 if (optParamIn(cp, section, "mt_state", state)) {
94 std::istringstream iss(state);
95 iss >> gen;
96 }
97}
98
99Random random_mt;