2 * Copyright (c) 2014 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.
28 * Authors: Anthony Gutierrez
33 * Definitions of a random replacement tag store.
36 #include "base/random.hh"
37 #include "debug/CacheRepl.hh"
38 #include "mem/cache/tags/random_repl.hh"
39 #include "mem/cache/base.hh"
41 RandomRepl::RandomRepl(const Params
*p
)
47 BaseSetAssoc::BlkType
*
48 RandomRepl::accessBlock(Addr addr
, bool is_secure
, Cycles
&lat
, int master_id
)
50 return BaseSetAssoc::accessBlock(addr
, is_secure
, lat
, master_id
);
53 BaseSetAssoc::BlkType
*
54 RandomRepl::findVictim(Addr addr
) const
56 BlkType
*blk
= BaseSetAssoc::findVictim(addr
);
58 // if all blocks are valid, pick a replacement at random
60 // find a random index within the bounds of the set
61 int idx
= random_mt
.random
<int>(0, assoc
- 1);
64 blk
= sets
[extractSet(addr
)].blks
[idx
];
66 DPRINTF(CacheRepl
, "set %x: selecting blk %x for replacement\n",
67 blk
->set
, regenerateBlkAddr(blk
->tag
, blk
->set
));
74 RandomRepl::insertBlock(PacketPtr pkt
, BlkType
*blk
)
76 BaseSetAssoc::insertBlock(pkt
, blk
);
80 RandomRepl::invalidate(BlkType
*blk
)
82 BaseSetAssoc::invalidate(blk
);
86 RandomReplParams::create()
88 return new RandomRepl(this);