free_list.cc revision 2665:a124942bacb8 
1/*
2 * Copyright (c) 2004-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Kevin Lim
29 */
30
31#include "base/trace.hh"
32
33#include "cpu/o3/free_list.hh"
34
35SimpleFreeList::SimpleFreeList(unsigned _numLogicalIntRegs,
36                               unsigned _numPhysicalIntRegs,
37                               unsigned _numLogicalFloatRegs,
38                               unsigned _numPhysicalFloatRegs)
39    : numLogicalIntRegs(_numLogicalIntRegs),
40      numPhysicalIntRegs(_numPhysicalIntRegs),
41      numLogicalFloatRegs(_numLogicalFloatRegs),
42      numPhysicalFloatRegs(_numPhysicalFloatRegs),
43      numPhysicalRegs(numPhysicalIntRegs + numPhysicalFloatRegs)
44{
45    DPRINTF(FreeList, "FreeList: Creating new free list object.\n");
46
47    // DEBUG stuff.
48    freeIntRegsScoreboard.resize(numPhysicalIntRegs);
49
50    freeFloatRegsScoreboard.resize(numPhysicalRegs);
51
52    for (PhysRegIndex i = 0; i < numLogicalIntRegs; ++i) {
53        freeIntRegsScoreboard[i] = 0;
54    }
55
56    // Put all of the extra physical registers onto the free list.  This
57    // means excluding all of the base logical registers.
58    for (PhysRegIndex i = numLogicalIntRegs;
59         i < numPhysicalIntRegs; ++i)
60    {
61        freeIntRegs.push(i);
62
63        freeIntRegsScoreboard[i] = 1;
64    }
65
66    for (PhysRegIndex i = 0; i < numPhysicalIntRegs + numLogicalFloatRegs;
67         ++i)
68    {
69        freeFloatRegsScoreboard[i] = 0;
70    }
71
72    // Put all of the extra physical registers onto the free list.  This
73    // means excluding all of the base logical registers.  Because the
74    // float registers' indices start where the physical registers end,
75    // some math must be done to determine where the free registers start.
76    for (PhysRegIndex i = numPhysicalIntRegs + numLogicalFloatRegs;
77         i < numPhysicalRegs; ++i)
78    {
79        freeFloatRegs.push(i);
80
81        freeFloatRegsScoreboard[i] = 1;
82    }
83}
84
85