1/*
2 * Copyright (c) 2004-2005 The Regents of The University of Michigan
3 * Copyright (c) 2013 Advanced Micro Devices, Inc.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met: redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer;
10 * redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution;
13 * neither the name of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Authors: Kevin Lim
30 */
31
32#include "base/trace.hh"
33#include "cpu/o3/free_list.hh"
34#include "debug/FreeList.hh"
35
35SimpleFreeList::SimpleFreeList(ThreadID activeThreads,
36 unsigned _numLogicalIntRegs,
37 unsigned _numPhysicalIntRegs,
38 unsigned _numLogicalFloatRegs,
39 unsigned _numPhysicalFloatRegs)
40 : numLogicalIntRegs(_numLogicalIntRegs),
41 numPhysicalIntRegs(_numPhysicalIntRegs),
42 numLogicalFloatRegs(_numLogicalFloatRegs),
43 numPhysicalFloatRegs(_numPhysicalFloatRegs),
44 numPhysicalRegs(numPhysicalIntRegs + numPhysicalFloatRegs)
36UnifiedFreeList::UnifiedFreeList(const std::string &_my_name,
37 PhysRegFile *_regFile)
38 : _name(_my_name), regFile(_regFile)
39{
40 DPRINTF(FreeList, "Creating new free list object.\n");
41
48 // Put all of the extra physical registers onto the free list. This
49 // means excluding all of the base logical registers.
50 for (PhysRegIndex i = numLogicalIntRegs * activeThreads;
51 i < numPhysicalIntRegs; ++i)
52 {
53 freeIntRegs.push(i);
54 }
55
56 // Put all of the extra physical registers onto the free list. This
57 // means excluding all of the base logical registers. Because the
58 // float registers' indices start where the physical registers end,
59 // some math must be done to determine where the free registers start.
60 PhysRegIndex i = numPhysicalIntRegs + (numLogicalFloatRegs * activeThreads);
61
62 for ( ; i < numPhysicalRegs; ++i)
63 {
64 freeFloatRegs.push(i);
65 }
42 // Have the register file initialize the free list since it knows
43 // about its internal organization
44 regFile->initFreeList(this);
45}
67
68std::string
69SimpleFreeList::name() const
70{
71 return "cpu.freelist";
72}