| /* |
| * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer; |
| * redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution; |
| * neither the name of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef __MEM_RUBY_SYSTEM_PERFECTCACHEMEMORY_HH__ |
| #define __MEM_RUBY_SYSTEM_PERFECTCACHEMEMORY_HH__ |
| |
| #include "base/hashmap.hh" |
| #include "mem/protocol/AccessPermission.hh" |
| #include "mem/ruby/common/Address.hh" |
| |
| template<class ENTRY> |
| struct PerfectCacheLineState |
| { |
| PerfectCacheLineState() { m_permission = AccessPermission_NUM; } |
| AccessPermission m_permission; |
| ENTRY m_entry; |
| }; |
| |
| template<class ENTRY> |
| inline std::ostream& |
| operator<<(std::ostream& out, const PerfectCacheLineState<ENTRY>& obj) |
| { |
| return out; |
| } |
| |
| template<class ENTRY> |
| class PerfectCacheMemory |
| { |
| public: |
| PerfectCacheMemory(); |
| |
| // tests to see if an address is present in the cache |
| bool isTagPresent(const Address& address) const; |
| |
| // Returns true if there is: |
| // a) a tag match on this address or there is |
| // b) an Invalid line in the same cache "way" |
| bool cacheAvail(const Address& address) const; |
| |
| // find an Invalid entry and sets the tag appropriate for the address |
| void allocate(const Address& address); |
| |
| void deallocate(const Address& address); |
| |
| // Returns with the physical address of the conflicting cache line |
| Address cacheProbe(const Address& newAddress) const; |
| |
| // looks an address up in the cache |
| ENTRY& lookup(const Address& address); |
| const ENTRY& lookup(const Address& address) const; |
| |
| // Get/Set permission of cache block |
| AccessPermission getPermission(const Address& address) const; |
| void changePermission(const Address& address, AccessPermission new_perm); |
| |
| // Print cache contents |
| void print(std::ostream& out) const; |
| |
| private: |
| // Private copy constructor and assignment operator |
| PerfectCacheMemory(const PerfectCacheMemory& obj); |
| PerfectCacheMemory& operator=(const PerfectCacheMemory& obj); |
| |
| // Data Members (m_prefix) |
| m5::hash_map<Address, PerfectCacheLineState<ENTRY> > m_map; |
| }; |
| |
| template<class ENTRY> |
| inline std::ostream& |
| operator<<(std::ostream& out, const PerfectCacheMemory<ENTRY>& obj) |
| { |
| obj.print(out); |
| out << std::flush; |
| return out; |
| } |
| |
| template<class ENTRY> |
| inline |
| PerfectCacheMemory<ENTRY>::PerfectCacheMemory() |
| { |
| } |
| |
| // tests to see if an address is present in the cache |
| template<class ENTRY> |
| inline bool |
| PerfectCacheMemory<ENTRY>::isTagPresent(const Address& address) const |
| { |
| return m_map.count(line_address(address)) > 0; |
| } |
| |
| template<class ENTRY> |
| inline bool |
| PerfectCacheMemory<ENTRY>::cacheAvail(const Address& address) const |
| { |
| return true; |
| } |
| |
| // find an Invalid or already allocated entry and sets the tag |
| // appropriate for the address |
| template<class ENTRY> |
| inline void |
| PerfectCacheMemory<ENTRY>::allocate(const Address& address) |
| { |
| PerfectCacheLineState<ENTRY> line_state; |
| line_state.m_permission = AccessPermission_Invalid; |
| line_state.m_entry = ENTRY(); |
| m_map[line_address(address)] = line_state; |
| } |
| |
| // deallocate entry |
| template<class ENTRY> |
| inline void |
| PerfectCacheMemory<ENTRY>::deallocate(const Address& address) |
| { |
| m_map.erase(line_address(address)); |
| } |
| |
| // Returns with the physical address of the conflicting cache line |
| template<class ENTRY> |
| inline Address |
| PerfectCacheMemory<ENTRY>::cacheProbe(const Address& newAddress) const |
| { |
| panic("cacheProbe called in perfect cache"); |
| return newAddress; |
| } |
| |
| // looks an address up in the cache |
| template<class ENTRY> |
| inline ENTRY& |
| PerfectCacheMemory<ENTRY>::lookup(const Address& address) |
| { |
| return m_map[line_address(address)].m_entry; |
| } |
| |
| // looks an address up in the cache |
| template<class ENTRY> |
| inline const ENTRY& |
| PerfectCacheMemory<ENTRY>::lookup(const Address& address) const |
| { |
| return m_map[line_address(address)].m_entry; |
| } |
| |
| template<class ENTRY> |
| inline AccessPermission |
| PerfectCacheMemory<ENTRY>::getPermission(const Address& address) const |
| { |
| return m_map[line_address(address)].m_permission; |
| } |
| |
| template<class ENTRY> |
| inline void |
| PerfectCacheMemory<ENTRY>::changePermission(const Address& address, |
| AccessPermission new_perm) |
| { |
| Address line_address = address; |
| line_address.makeLineAddress(); |
| PerfectCacheLineState<ENTRY>& line_state = m_map[line_address]; |
| line_state.m_permission = new_perm; |
| } |
| |
| template<class ENTRY> |
| inline void |
| PerfectCacheMemory<ENTRY>::print(std::ostream& out) const |
| { |
| } |
| |
| #endif // __MEM_RUBY_SYSTEM_PERFECTCACHEMEMORY_HH__ |