gem5/cpu/o3/ras.hh
Kevin Lim f3358e5f7b O3 CPU now handles being used with the sampler.
cpu/o3/2bit_local_pred.cc:
cpu/o3/2bit_local_pred.hh:
cpu/o3/bpred_unit.hh:
cpu/o3/bpred_unit_impl.hh:
cpu/o3/btb.cc:
cpu/o3/btb.hh:
cpu/o3/commit.hh:
cpu/o3/commit_impl.hh:
cpu/o3/cpu.cc:
cpu/o3/cpu.hh:
cpu/o3/decode.hh:
cpu/o3/decode_impl.hh:
cpu/o3/fetch.hh:
cpu/o3/fetch_impl.hh:
cpu/o3/fu_pool.cc:
cpu/o3/fu_pool.hh:
cpu/o3/iew.hh:
cpu/o3/iew_impl.hh:
cpu/o3/inst_queue.hh:
cpu/o3/inst_queue_impl.hh:
cpu/o3/lsq.hh:
cpu/o3/lsq_impl.hh:
cpu/o3/lsq_unit.hh:
cpu/o3/lsq_unit_impl.hh:
cpu/o3/mem_dep_unit.hh:
cpu/o3/mem_dep_unit_impl.hh:
cpu/o3/ras.cc:
cpu/o3/ras.hh:
cpu/o3/rename.hh:
cpu/o3/rename_impl.hh:
cpu/o3/rob.hh:
cpu/o3/rob_impl.hh:
cpu/o3/sat_counter.cc:
cpu/o3/sat_counter.hh:
cpu/o3/thread_state.hh:
    Handle switching out and taking over.  Needs to be able to reset all state.
cpu/o3/alpha_cpu_impl.hh:
    Handle taking over from another XC.

--HG--
extra : convert_revision : b936e826f0f8a18319bfa940ff35097b4192b449
2006-05-04 11:36:20 -04:00

95 lines
3.2 KiB
C++

/*
* 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_RAS_HH__
#define __CPU_O3_RAS_HH__
// For Addr type.
#include "arch/isa_traits.hh"
#include <vector>
/** Return address stack class, implements a simple RAS. */
class ReturnAddrStack
{
public:
/** Creates a return address stack, but init() must be called prior to
* use.
*/
ReturnAddrStack() {}
/** Initializes RAS with a specified number of entries.
* @param numEntries Number of entries in the RAS.
*/
void init(unsigned numEntries);
void reset();
/** Returns the top address on the RAS. */
Addr top()
{ return addrStack[tos]; }
/** Returns the index of the top of the RAS. */
unsigned topIdx()
{ return tos; }
/** Pushes an address onto the RAS. */
void push(const Addr &return_addr);
/** Pops the top address from the RAS. */
void pop();
/** Changes index to the top of the RAS, and replaces the top address with
* a new target.
* @param top_entry_idx The index of the RAS that will now be the top.
* @param restored_target The new target address of the new top of the RAS.
*/
void restore(unsigned top_entry_idx, const Addr &restored_target);
private:
/** Increments the top of stack index. */
inline void incrTos()
{ if (++tos == numEntries) tos = 0; }
/** Decrements the top of stack index. */
inline void decrTos()
{ tos = (tos == 0 ? numEntries - 1 : tos - 1); }
/** The RAS itself. */
std::vector<Addr> addrStack;
/** The number of entries in the RAS. */
unsigned numEntries;
/** The number of used entries in the RAS. */
unsigned usedEntries;
/** The top of stack index. */
unsigned tos;
};
#endif // __CPU_O3_RAS_HH__