80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
/*
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* Copyright (c) 2004-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __CPU_O3_CPU_BTB_HH__
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#define __CPU_O3_CPU_BTB_HH__
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// For Addr type.
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#include "arch/isa_traits.hh"
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class DefaultBTB
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{
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private:
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struct BTBEntry
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{
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BTBEntry()
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: tag(0), target(0), valid(false)
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{
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}
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Addr tag;
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Addr target;
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bool valid;
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};
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public:
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DefaultBTB(unsigned numEntries, unsigned tagBits,
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unsigned instShiftAmt);
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Addr lookup(const Addr &inst_PC);
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bool valid(const Addr &inst_PC);
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void update(const Addr &inst_PC, const Addr &target_PC);
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private:
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inline unsigned getIndex(const Addr &inst_PC);
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inline Addr getTag(const Addr &inst_PC);
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BTBEntry *btb;
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unsigned numEntries;
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unsigned idxMask;
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unsigned tagBits;
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unsigned tagMask;
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unsigned instShiftAmt;
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unsigned tagShiftAmt;
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};
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#endif // __CPU_O3_CPU_BTB_HH__
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