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Diffstat (limited to 'src/cpu/o3/rename_map.hh')
| -rw-r--r-- | src/cpu/o3/rename_map.hh | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/cpu/o3/rename_map.hh b/src/cpu/o3/rename_map.hh new file mode 100644 index 000000000..57be4a64a --- /dev/null +++ b/src/cpu/o3/rename_map.hh @@ -0,0 +1,173 @@ +/* + * Copyright (c) 2004-2005 The Regents of The University of Michigan + * 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. + */ + +// Todo: Create destructor. +// Have it so that there's a more meaningful name given to the variable +// that marks the beginning of the FP registers. + +#ifndef __CPU_O3_CPU_RENAME_MAP_HH__ +#define __CPU_O3_CPU_RENAME_MAP_HH__ + +#include <iostream> +#include <utility> +#include <vector> + +#include "cpu/o3/free_list.hh" +//For RegIndex +#include "arch/isa_traits.hh" + +class SimpleRenameMap +{ + protected: + typedef TheISA::RegIndex RegIndex; + public: + /** + * Pair of a logical register and a physical register. Tells the + * previous mapping of a logical register to a physical register. + * Used to roll back the rename map to a previous state. + */ + typedef std::pair<RegIndex, PhysRegIndex> UnmapInfo; + + /** + * Pair of a physical register and a physical register. Used to + * return the physical register that a logical register has been + * renamed to, and the previous physical register that the same + * logical register was previously mapped to. + */ + typedef std::pair<PhysRegIndex, PhysRegIndex> RenameInfo; + + public: + //Constructor + SimpleRenameMap(unsigned _numLogicalIntRegs, + unsigned _numPhysicalIntRegs, + unsigned _numLogicalFloatRegs, + unsigned _numPhysicalFloatRegs, + unsigned _numMiscRegs, + RegIndex _intZeroReg, + RegIndex _floatZeroReg); + + /** Destructor. */ + ~SimpleRenameMap(); + + void setFreeList(SimpleFreeList *fl_ptr); + + //Tell rename map to get a free physical register for a given + //architected register. Not sure it should have a return value, + //but perhaps it should have some sort of fault in case there are + //no free registers. + RenameInfo rename(RegIndex arch_reg); + + PhysRegIndex lookup(RegIndex phys_reg); + + bool isReady(PhysRegIndex arch_reg); + + /** + * Marks the given register as ready, meaning that its value has been + * calculated and written to the register file. + * @param ready_reg The index of the physical register that is now ready. + */ + void markAsReady(PhysRegIndex ready_reg); + + void setEntry(RegIndex arch_reg, PhysRegIndex renamed_reg); + + void squash(std::vector<RegIndex> freed_regs, + std::vector<UnmapInfo> unmaps); + + int numFreeEntries(); + + private: + /** Number of logical integer registers. */ + int numLogicalIntRegs; + + /** Number of physical integer registers. */ + int numPhysicalIntRegs; + + /** Number of logical floating point registers. */ + int numLogicalFloatRegs; + + /** Number of physical floating point registers. */ + int numPhysicalFloatRegs; + + /** Number of miscellaneous registers. */ + int numMiscRegs; + + /** Number of logical integer + float registers. */ + int numLogicalRegs; + + /** Number of physical integer + float registers. */ + int numPhysicalRegs; + + /** The integer zero register. This implementation assumes it is always + * zero and never can be anything else. + */ + RegIndex intZeroReg; + + /** The floating point zero register. This implementation assumes it is + * always zero and never can be anything else. + */ + RegIndex floatZeroReg; + + class RenameEntry + { + public: + PhysRegIndex physical_reg; + bool valid; + + RenameEntry() + : physical_reg(0), valid(false) + { } + }; + + /** Integer rename map. */ + RenameEntry *intRenameMap; + + /** Floating point rename map. */ + RenameEntry *floatRenameMap; + + /** Free list interface. */ + SimpleFreeList *freeList; + + // Might want to make all these scoreboards into one large scoreboard. + + /** Scoreboard of physical integer registers, saying whether or not they + * are ready. + */ + std::vector<bool> intScoreboard; + + /** Scoreboard of physical floating registers, saying whether or not they + * are ready. + */ + std::vector<bool> floatScoreboard; + + /** Scoreboard of miscellaneous registers, saying whether or not they + * are ready. + */ + std::vector<bool> miscScoreboard; +}; + +#endif //__CPU_O3_CPU_RENAME_MAP_HH__ |