1/** 2 * Copyright (c) 2018 Inria 3 * All rights reserved. 4 * 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;
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28 * Authors: Daniel Carvalho 29 */ 30 31#ifndef __MEM_CACHE_REPLACEMENT_POLICIES_BASE_HH__ 32#define __MEM_CACHE_REPLACEMENT_POLICIES_BASE_HH__ 33 34#include <memory> 35
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36#include "mem/cache/replacement_policies/replaceable_entry.hh" |
37#include "params/BaseReplacementPolicy.hh" 38#include "sim/sim_object.hh" 39 40/**
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40 * The replacement data needed by the replacement policy.
41 * Each replacement policy should have its own replacement data.
42 */
43struct ReplacementData {};
44
45/**
46 * A replaceable entry is used by any table-like structure that needs to
47 * implement replacement functionality. It provides the replacement data
48 * pointer instantiated and needed by the replacement policy used.
49 * @sa Replacement Policies
50 */
51class ReplaceableEntry
52{
53 private:
54 /**
55 * Set to which this entry belongs.
56 */
57 uint32_t _set;
58
59 /**
60 * Way (relative position within the set) to which this entry belongs.
61 */
62 uint32_t _way;
63
64 public:
65 /**
66 * Replacement data associated to this entry.
67 * It is instantiated by the replacement policy.
68 */
69 std::shared_ptr<ReplacementData> replacementData;
70
71 /**
72 * Set both the set and way. Should be called only once.
73 *
74 * @param set The set of this entry.
75 * @param way The way of this entry.
76 */
77 void setPosition(const uint32_t set, const uint32_t way) {
78 _set = set;
79 _way = way;
80 }
81
82 /**
83 * Get set number.
84 *
85 * @return The set to which this entry belongs.
86 */
87 uint32_t getSet() const { return _set; }
88
89 /**
90 * Get way number.
91 *
92 * @return The way to which this entry belongs.
93 */
94 uint32_t getWay() const { return _way; }
95};
96
97/**
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41 * Replacement candidates as chosen by the indexing policy. 42 */ 43typedef std::vector<ReplaceableEntry*> ReplacementCandidates; 44 45/** 46 * A common base class of cache replacement policy objects. 47 */ 48class BaseReplacementPolicy : public SimObject
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