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-/*
- * 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.
- */
-
-#ifndef __CPU_O3_FREE_LIST_HH__
-#define __CPU_O3_FREE_LIST_HH__
-
-#include <iostream>
-#include <queue>
-
-#include "arch/isa_traits.hh"
-#include "base/trace.hh"
-#include "base/traceflags.hh"
-#include "cpu/o3/comm.hh"
-
-/**
- * FreeList class that simply holds the list of free integer and floating
- * point registers. Can request for a free register of either type, and
- * also send back free registers of either type. This is a very simple
- * class, but it should be sufficient for most implementations. Like all
- * other classes, it assumes that the indices for the floating point
- * registers starts after the integer registers end. Hence the variable
- * numPhysicalIntRegs is logically equivalent to the baseFP dependency.
- * Note that while this most likely should be called FreeList, the name
- * "FreeList" is used in a typedef within the CPU Policy, and therefore no
- * class can be named simply "FreeList".
- * @todo: Give a better name to the base FP dependency.
- */
-class SimpleFreeList
-{
- private:
- /** The list of free integer registers. */
- std::queue<PhysRegIndex> freeIntRegs;
-
- /** The list of free floating point registers. */
- std::queue<PhysRegIndex> freeFloatRegs;
-
- /** 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;
-
- /** Total number of physical registers. */
- int numPhysicalRegs;
-
- public:
- /** Constructs a free list.
- * @param activeThreads Number of active threads.
- * @param _numLogicalIntRegs Number of logical integer registers.
- * @param _numPhysicalIntRegs Number of physical integer registers.
- * @param _numLogicalFloatRegs Number of logical fp registers.
- * @param _numPhysicalFloatRegs Number of physical fp registers.
- */
- SimpleFreeList(unsigned activeThreads,
- unsigned _numLogicalIntRegs,
- unsigned _numPhysicalIntRegs,
- unsigned _numLogicalFloatRegs,
- unsigned _numPhysicalFloatRegs);
-
- /** Gives the name of the freelist. */
- std::string name() const;
-
- /** Gets a free integer register. */
- inline PhysRegIndex getIntReg();
-
- /** Gets a free fp register. */
- inline PhysRegIndex getFloatReg();
-
- /** Adds a register back to the free list. */
- inline void addReg(PhysRegIndex freed_reg);
-
- /** Adds an integer register back to the free list. */
- inline void addIntReg(PhysRegIndex freed_reg);
-
- /** Adds a fp register back to the free list. */
- inline void addFloatReg(PhysRegIndex freed_reg);
-
- /** Checks if there are any free integer registers. */
- bool hasFreeIntRegs()
- { return !freeIntRegs.empty(); }
-
- /** Checks if there are any free fp registers. */
- bool hasFreeFloatRegs()
- { return !freeFloatRegs.empty(); }
-
- /** Returns the number of free integer registers. */
- int numFreeIntRegs()
- { return freeIntRegs.size(); }
-
- /** Returns the number of free fp registers. */
- int numFreeFloatRegs()
- { return freeFloatRegs.size(); }
-};
-
-inline PhysRegIndex
-SimpleFreeList::getIntReg()
-{
- DPRINTF(FreeList, "Trying to get free integer register.\n");
-
- if (freeIntRegs.empty()) {
- panic("No free integer registers!");
- }
-
- PhysRegIndex free_reg = freeIntRegs.front();
-
- freeIntRegs.pop();
-
- return(free_reg);
-}
-
-inline PhysRegIndex
-SimpleFreeList::getFloatReg()
-{
- DPRINTF(FreeList, "Trying to get free float register.\n");
-
- if (freeFloatRegs.empty()) {
- panic("No free integer registers!");
- }
-
- PhysRegIndex free_reg = freeFloatRegs.front();
-
- freeFloatRegs.pop();
-
- return(free_reg);
-}
-
-inline void
-SimpleFreeList::addReg(PhysRegIndex freed_reg)
-{
- DPRINTF(FreeList,"Freeing register %i.\n", freed_reg);
- //Might want to add in a check for whether or not this register is
- //already in there. A bit vector or something similar would be useful.
- if (freed_reg < numPhysicalIntRegs) {
- if (freed_reg != TheISA::ZeroReg)
- freeIntRegs.push(freed_reg);
- } else if (freed_reg < numPhysicalRegs) {
- if (freed_reg != (TheISA::ZeroReg + numPhysicalIntRegs))
- freeFloatRegs.push(freed_reg);
- }
-}
-
-inline void
-SimpleFreeList::addIntReg(PhysRegIndex freed_reg)
-{
- DPRINTF(FreeList,"Freeing int register %i.\n", freed_reg);
-
- freeIntRegs.push(freed_reg);
-}
-
-inline void
-SimpleFreeList::addFloatReg(PhysRegIndex freed_reg)
-{
- DPRINTF(FreeList,"Freeing float register %i.\n", freed_reg);
-
- freeFloatRegs.push(freed_reg);
-}
-
-#endif // __CPU_O3_FREE_LIST_HH__
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