CacheMemory.hh revision 7454 
1/*
2 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
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;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef __MEM_RUBY_SYSTEM_CACHEMEMORY_HH__
30#define __MEM_RUBY_SYSTEM_CACHEMEMORY_HH__
31
32#include <iostream>
33#include <string>
34#include <vector>
35
36#include "base/hashmap.hh"
37#include "mem/protocol/AccessPermission.hh"
38#include "mem/protocol/CacheMsg.hh"
39#include "mem/protocol/CacheRequestType.hh"
40#include "mem/protocol/MachineType.hh"
41#include "mem/ruby/common/Address.hh"
42#include "mem/ruby/common/DataBlock.hh"
43#include "mem/ruby/common/Global.hh"
44#include "mem/ruby/profiler/CacheProfiler.hh"
45#include "mem/ruby/recorder/CacheRecorder.hh"
46#include "mem/ruby/slicc_interface/AbstractCacheEntry.hh"
47#include "mem/ruby/slicc_interface/AbstractController.hh"
48#include "mem/ruby/slicc_interface/RubySlicc_ComponentMapping.hh"
49#include "mem/ruby/system/LRUPolicy.hh"
50#include "mem/ruby/system/PseudoLRUPolicy.hh"
51#include "mem/ruby/system/System.hh"
52#include "params/RubyCache.hh"
53#include "sim/sim_object.hh"
54
55class CacheMemory : public SimObject
56{
57  public:
58    typedef RubyCacheParams Params;
59    CacheMemory(const Params *p);
60    ~CacheMemory();
61
62    void init();
63
64    // Public Methods
65    void printConfig(std::ostream& out);
66
67    // perform a cache access and see if we hit or not.  Return true on a hit.
68    bool tryCacheAccess(const Address& address, CacheRequestType type,
69                        DataBlock*& data_ptr);
70
71    // similar to above, but doesn't require full access check
72    bool testCacheAccess(const Address& address, CacheRequestType type,
73                         DataBlock*& data_ptr);
74
75    // tests to see if an address is present in the cache
76    bool isTagPresent(const Address& address) const;
77
78    // Returns true if there is:
79    //   a) a tag match on this address or there is
80    //   b) an unused line in the same cache "way"
81    bool cacheAvail(const Address& address) const;
82
83    // find an unused entry and sets the tag appropriate for the address
84    void allocate(const Address& address, AbstractCacheEntry* new_entry);
85
86    // Explicitly free up this address
87    void deallocate(const Address& address);
88
89    // Returns with the physical address of the conflicting cache line
90    Address cacheProbe(const Address& address) const;
91
92    // looks an address up in the cache
93    AbstractCacheEntry& lookup(const Address& address);
94    const AbstractCacheEntry& lookup(const Address& address) const;
95
96    // Get/Set permission of cache block
97    AccessPermission getPermission(const Address& address) const;
98    void changePermission(const Address& address, AccessPermission new_perm);
99
100    int getLatency() const { return m_latency; }
101
102    // Hook for checkpointing the contents of the cache
103    void recordCacheContents(CacheRecorder& tr) const;
104    void
105    setAsInstructionCache(bool is_icache)
106    {
107        m_is_instruction_only_cache = is_icache;
108    }
109
110    // Set this address to most recently used
111    void setMRU(const Address& address);
112
113    void profileMiss(const CacheMsg & msg);
114
115    void getMemoryValue(const Address& addr, char* value,
116                        unsigned int size_in_bytes);
117    void setMemoryValue(const Address& addr, char* value,
118                        unsigned int size_in_bytes);
119
120    void setLocked (const Address& addr, int context);
121    void clearLocked (const Address& addr);
122    bool isLocked (const Address& addr, int context);
123    // Print cache contents
124    void print(std::ostream& out) const;
125    void printData(std::ostream& out) const;
126
127    void clearStats() const;
128    void printStats(std::ostream& out) const;
129
130  private:
131    // convert a Address to its location in the cache
132    Index addressToCacheSet(const Address& address) const;
133
134    // Given a cache tag: returns the index of the tag in a set.
135    // returns -1 if the tag is not found.
136    int findTagInSet(Index line, const Address& tag) const;
137    int findTagInSetIgnorePermissions(Index cacheSet,
138                                      const Address& tag) const;
139
140    // Private copy constructor and assignment operator
141    CacheMemory(const CacheMemory& obj);
142    CacheMemory& operator=(const CacheMemory& obj);
143
144  private:
145    const std::string m_cache_name;
146    int m_latency;
147
148    // Data Members (m_prefix)
149    bool m_is_instruction_only_cache;
150    bool m_is_data_only_cache;
151
152    // The first index is the # of cache lines.
153    // The second index is the the amount associativity.
154    m5::hash_map<Address, int> m_tag_index;
155    std::vector<std::vector<AbstractCacheEntry*> > m_cache;
156    std::vector<std::vector<int> > m_locked;
157
158    AbstractReplacementPolicy *m_replacementPolicy_ptr;
159
160    CacheProfiler* m_profiler_ptr;
161
162    int m_cache_size;
163    std::string m_policy;
164    int m_cache_num_sets;
165    int m_cache_num_set_bits;
166    int m_cache_assoc;
167};
168
169#endif // __MEM_RUBY_SYSTEM_CACHEMEMORY_HH__
170
171