1/* 2 * Copyright (c) 2012-2014,2017 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 --- 45 unchanged lines hidden (view full) --- 54 55#include "base/logging.hh" 56#include "base/types.hh" 57#include "debug/CacheRepl.hh" 58#include "mem/cache/base.hh" 59#include "mem/cache/blk.hh" 60#include "mem/cache/replacement_policies/base.hh" 61#include "mem/cache/tags/base.hh" |
62#include "params/BaseSetAssoc.hh" 63 64/** 65 * A BaseSetAssoc cache tag store. 66 * @sa \ref gem5MemorySystem "gem5 Memory System" 67 * 68 * The BaseSetAssoc placement policy divides the cache into s sets of w 69 * cache lines (ways). A cache line is mapped onto a set, and can be placed 70 * into any of the ways of this set. 71 */ 72class BaseSetAssoc : public BaseTags 73{ 74 public: 75 /** Typedef the block type used in this tag store. */ 76 typedef CacheBlk BlkType; 77 /** Typedef the set type used in this tag store. */ |
78 typedef std::vector<CacheBlk*> SetType; |
79 80 protected: 81 /** The associativity of the cache. */ 82 const unsigned assoc; 83 /** The allocatable associativity of the cache (alloc mask). */ 84 unsigned allocAssoc; 85 86 /** The cache blocks. */ --- 13 unchanged lines hidden (view full) --- 100 /** The amount to shift the address to get the tag. */ 101 int tagShift; 102 /** Mask out all bits that aren't part of the set index. */ 103 unsigned setMask; 104 105 /** Replacement policy */ 106 BaseReplacementPolicy *replacementPolicy; 107 |
108 /** 109 * Find all possible block locations for insertion and replacement of 110 * an address. Should be called immediately before ReplacementPolicy's 111 * findVictim() not to break cache resizing. 112 * Returns blocks in all ways belonging to the set of the address. 113 * 114 * @param addr The addr to a find possible locations for. 115 * @return The possible locations. 116 */ 117 std::vector<ReplaceableEntry*> getPossibleLocations(const Addr addr) const 118 override 119 { 120 std::vector<ReplaceableEntry*> locations; 121 for (const auto& blk : sets[extractSet(addr)]) { 122 locations.push_back(static_cast<ReplaceableEntry*>(blk)); 123 } 124 return locations; 125 } 126 |
127 public: 128 /** Convenience typedef. */ 129 typedef BaseSetAssocParams Params; 130 131 /** 132 * Construct and initialize this tag store. 133 */ 134 BaseSetAssoc(const Params *p); --- 65 unchanged lines hidden (view full) --- 200 // If a cache miss 201 lat = lookupLatency; 202 } 203 204 return blk; 205 } 206 207 /** |
208 * Find a block given set and way. 209 * 210 * @param set The set of the block. 211 * @param way The way of the block. 212 * @return The block. 213 */ 214 ReplaceableEntry* findBlockBySetAndWay(int set, int way) const override; 215 --- 5 unchanged lines hidden (view full) --- 221 * @param is_secure True if the target memory space is secure. 222 * @param evict_blks Cache blocks to be evicted. 223 * @return Cache block to be replaced. 224 */ 225 CacheBlk* findVictim(Addr addr, const bool is_secure, 226 std::vector<CacheBlk*>& evict_blks) const override 227 { 228 // Get possible locations for the victim block |
229 std::vector<ReplaceableEntry*> locations = getPossibleLocations(addr); |
230 231 // Choose replacement victim from replacement candidates 232 CacheBlk* victim = static_cast<CacheBlk*>(replacementPolicy->getVictim( 233 std::vector<ReplaceableEntry*>( 234 locations.begin(), locations.end()))); 235 236 // There is only one eviction for this replacement 237 evict_blks.push_back(victim); 238 239 DPRINTF(CacheRepl, "set %x, way %x: selecting blk for replacement\n", 240 victim->set, victim->way); 241 242 return victim; 243 } 244 245 /** |
246 * Insert the new block into the cache and update replacement data. 247 * 248 * @param addr Address of the block. 249 * @param is_secure Whether the block is in secure space or not. 250 * @param src_master_ID The source requestor ID. 251 * @param task_ID The new task ID. 252 * @param blk The block to update. 253 */ --- 83 unchanged lines hidden --- |