1/*
2 * Copyright (c) 2012-2014 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) 2003-2005,2014 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
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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: Erik Hallnor
41 */
42
43/**
44 * @file
45 * Definitions of a base set associative tag store.
46 */
47
48#include "mem/cache/tags/base_set_assoc.hh"
49
50#include <string>
51
52#include "base/intmath.hh"
53
54BaseSetAssoc::BaseSetAssoc(const Params *p)
55 :BaseTags(p), assoc(p->assoc), allocAssoc(p->assoc),
56 blks(p->size / p->block_size),
57 numSets(p->size / (p->block_size * p->assoc)),
58 sequentialAccess(p->sequential_access),
59 sets(p->size / (p->block_size * p->assoc)),
60 replacementPolicy(p->replacement_policy)
61{
62 // Check parameters
63 if (blkSize < 4 || !isPowerOf2(blkSize)) {
64 fatal("Block size must be at least 4 and a power of 2");
65 }
66 if (!isPowerOf2(numSets)) {
67 fatal("# of sets must be non-zero and a power of 2");
68 }
69 if (assoc <= 0) {
70 fatal("associativity must be greater than zero");
71 }
72
73 setShift = floorLog2(blkSize);
74 setMask = numSets - 1;
75 tagShift = setShift + floorLog2(numSets);
76
77 unsigned blkIndex = 0; // index into blks array
78 for (unsigned i = 0; i < numSets; ++i) {
79 sets[i].assoc = assoc;
80
81 sets[i].blks.resize(assoc);
82
83 // link in the data blocks
84 for (unsigned j = 0; j < assoc; ++j) {
85 // Select block within the set to be linked
86 BlkType*& blk = sets[i].blks[j];
87
88 // Locate next cache block
89 blk = &blks[blkIndex];
90
91 // Associate a data chunk to the block
92 blk->data = &dataBlks[blkSize*blkIndex];
93
94 // Associate a replacement data entry to the block
95 blk->replacementData = replacementPolicy->instantiateEntry();
96
97 // Setting the tag to j is just to prevent long chains in the
98 // hash table; won't matter because the block is invalid
99 blk->tag = j;
100
101 // Set its set and way
102 blk->set = i;
103 blk->way = j;
104
105 // Update block index
106 ++blkIndex;
107 }
108 }
109}
110
111void
112BaseSetAssoc::invalidate(CacheBlk *blk)
113{
114 BaseTags::invalidate(blk);
115
116 // Invalidate replacement data
117 replacementPolicy->invalidate(blk->replacementData);
118}
119
120CacheBlk*
121BaseSetAssoc::findBlock(Addr addr, bool is_secure) const
122{
123 Addr tag = extractTag(addr);
124 unsigned set = extractSet(addr);
125 BlkType *blk = sets[set].findBlk(tag, is_secure);
126 return blk;
127}
128
| 1/*
2 * Copyright (c) 2012-2014 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) 2003-2005,2014 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
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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: Erik Hallnor
41 */
42
43/**
44 * @file
45 * Definitions of a base set associative tag store.
46 */
47
48#include "mem/cache/tags/base_set_assoc.hh"
49
50#include <string>
51
52#include "base/intmath.hh"
53
54BaseSetAssoc::BaseSetAssoc(const Params *p)
55 :BaseTags(p), assoc(p->assoc), allocAssoc(p->assoc),
56 blks(p->size / p->block_size),
57 numSets(p->size / (p->block_size * p->assoc)),
58 sequentialAccess(p->sequential_access),
59 sets(p->size / (p->block_size * p->assoc)),
60 replacementPolicy(p->replacement_policy)
61{
62 // Check parameters
63 if (blkSize < 4 || !isPowerOf2(blkSize)) {
64 fatal("Block size must be at least 4 and a power of 2");
65 }
66 if (!isPowerOf2(numSets)) {
67 fatal("# of sets must be non-zero and a power of 2");
68 }
69 if (assoc <= 0) {
70 fatal("associativity must be greater than zero");
71 }
72
73 setShift = floorLog2(blkSize);
74 setMask = numSets - 1;
75 tagShift = setShift + floorLog2(numSets);
76
77 unsigned blkIndex = 0; // index into blks array
78 for (unsigned i = 0; i < numSets; ++i) {
79 sets[i].assoc = assoc;
80
81 sets[i].blks.resize(assoc);
82
83 // link in the data blocks
84 for (unsigned j = 0; j < assoc; ++j) {
85 // Select block within the set to be linked
86 BlkType*& blk = sets[i].blks[j];
87
88 // Locate next cache block
89 blk = &blks[blkIndex];
90
91 // Associate a data chunk to the block
92 blk->data = &dataBlks[blkSize*blkIndex];
93
94 // Associate a replacement data entry to the block
95 blk->replacementData = replacementPolicy->instantiateEntry();
96
97 // Setting the tag to j is just to prevent long chains in the
98 // hash table; won't matter because the block is invalid
99 blk->tag = j;
100
101 // Set its set and way
102 blk->set = i;
103 blk->way = j;
104
105 // Update block index
106 ++blkIndex;
107 }
108 }
109}
110
111void
112BaseSetAssoc::invalidate(CacheBlk *blk)
113{
114 BaseTags::invalidate(blk);
115
116 // Invalidate replacement data
117 replacementPolicy->invalidate(blk->replacementData);
118}
119
120CacheBlk*
121BaseSetAssoc::findBlock(Addr addr, bool is_secure) const
122{
123 Addr tag = extractTag(addr);
124 unsigned set = extractSet(addr);
125 BlkType *blk = sets[set].findBlk(tag, is_secure);
126 return blk;
127}
128
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