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40 * Authors: Erik Hallnor
45 * Definitions of a base set associative tag store.
48 #include "mem/cache/tags/base_set_assoc.hh"
52 #include "base/intmath.hh"
54 BaseSetAssoc::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
)
63 if (blkSize
< 4 || !isPowerOf2(blkSize
)) {
64 fatal("Block size must be at least 4 and a power of 2");
66 if (!isPowerOf2(numSets
)) {
67 fatal("# of sets must be non-zero and a power of 2");
70 fatal("associativity must be greater than zero");
73 setShift
= floorLog2(blkSize
);
74 setMask
= numSets
- 1;
75 tagShift
= setShift
+ floorLog2(numSets
);
77 unsigned blkIndex
= 0; // index into blks array
78 for (unsigned i
= 0; i
< numSets
; ++i
) {
79 sets
[i
].assoc
= assoc
;
81 sets
[i
].blks
.resize(assoc
);
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
];
88 // Locate next cache block
89 blk
= &blks
[blkIndex
];
91 // Associate a data chunk to the block
92 blk
->data
= &dataBlks
[blkSize
*blkIndex
];
94 // Associate a replacement data entry to the block
95 blk
->replacementData
= replacementPolicy
->instantiateEntry();
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
101 // Set its set and way
105 // Update block index
112 BaseSetAssoc::invalidate(CacheBlk
*blk
)
114 BaseTags::invalidate(blk
);
116 // Decrease the number of tags in use
119 // Invalidate replacement data
120 replacementPolicy
->invalidate(blk
->replacementData
);
124 BaseSetAssoc::findBlock(Addr addr
, bool is_secure
) const
126 Addr tag
= extractTag(addr
);
127 unsigned set
= extractSet(addr
);
128 BlkType
*blk
= sets
[set
].findBlk(tag
, is_secure
);
133 BaseSetAssoc::findBlockBySetAndWay(int set
, int way
) const
135 return sets
[set
].blks
[way
];
139 BaseSetAssocParams::create()
141 return new BaseSetAssoc(this);