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;

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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