9f1ef800ae6ae4066d1be2070526ca9721128ab5
2 * Copyright (c) 2014 The Regents of The University of Michigan
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6 * modification, are permitted provided that the following conditions are
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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
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23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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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
)
48 RandomRepl::accessBlock(Addr addr
, bool is_secure
, Cycles
&lat
, int master_id
)
50 return BaseSetAssoc::accessBlock(addr
, is_secure
, lat
, master_id
);
54 RandomRepl::findVictim(Addr addr
)
56 CacheBlk
*blk
= BaseSetAssoc::findVictim(addr
);
57 unsigned set
= extractSet(addr
);
59 // if all blocks are valid, pick a replacement at random
60 if (blk
&& blk
->isValid()) {
61 // find a random index within the bounds of the set
62 int idx
= random_mt
.random
<int>(0, assoc
- 1);
63 blk
= sets
[set
].blks
[idx
];
64 // Enforce allocation limit
65 while (blk
->way
>= allocAssoc
) {
66 idx
= (idx
+ 1) % assoc
;
67 blk
= sets
[set
].blks
[idx
];
72 assert(blk
->way
< allocAssoc
);
74 DPRINTF(CacheRepl
, "set %x: selecting blk %x for replacement\n",
75 blk
->set
, regenerateBlkAddr(blk
->tag
, blk
->set
));
82 RandomRepl::insertBlock(PacketPtr pkt
, BlkType
*blk
)
84 BaseSetAssoc::insertBlock(pkt
, blk
);
88 RandomRepl::invalidate(CacheBlk
*blk
)
90 BaseSetAssoc::invalidate(blk
);
94 RandomReplParams::create()
96 return new RandomRepl(this);