1/*
2 * Copyright (c) 2005-2006 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

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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: Korey Sewell
29 * Kevin Lim
30 */
31
32#ifndef __CPU_O3_SCOREBOARD_HH__
33#define __CPU_O3_SCOREBOARD_HH__
34
35#include <iostream>
36#include <utility>
37#include <vector>
38
39#include "base/trace.hh"
40#include "cpu/o3/comm.hh"
41
42/**
43 * Implements a simple scoreboard to track which registers are ready.
44 * This class assumes that the fp registers start, index wise, right after
45 * the integer registers. The misc. registers start, index wise, right after
46 * the fp registers.
47 * @todo: Fix up handling of the zero register in case the decoder does not
48 * automatically make insts that write the zero register into nops.
49 */
50class Scoreboard
51{
52 public:
53 /** Constructs a scoreboard.
54 * @param activeThreads The number of active threads.
55 * @param _numLogicalIntRegs Number of logical integer registers.
56 * @param _numPhysicalIntRegs Number of physical integer registers.
57 * @param _numLogicalFloatRegs Number of logical fp registers.
58 * @param _numPhysicalFloatRegs Number of physical fp registers.
59 * @param _numMiscRegs Number of miscellaneous registers.
60 * @param _zeroRegIdx Index of the zero register.
61 */
62 Scoreboard(unsigned activeThreads,
63 unsigned _numLogicalIntRegs,
64 unsigned _numPhysicalIntRegs,
65 unsigned _numLogicalFloatRegs,
66 unsigned _numPhysicalFloatRegs,
67 unsigned _numMiscRegs,
68 unsigned _zeroRegIdx);
69
70 /** Destructor. */
71 ~Scoreboard() {}
72
73 /** Returns the name of the scoreboard. */
74 std::string name() const;
75
76 /** Checks if the register is ready. */
77 bool getReg(PhysRegIndex ready_reg);
78
79 /** Sets the register as ready. */
80 void setReg(PhysRegIndex phys_reg);
81
82 /** Sets the register as not ready. */
83 void unsetReg(PhysRegIndex ready_reg);
84
85 private:
86 /** Scoreboard of physical integer registers, saying whether or not they
87 * are ready.
88 */
89 std::vector<bool> regScoreBoard;
90
91 /** Number of logical integer registers. */
92 int numLogicalIntRegs;
93
94 /** Number of physical integer registers. */
95 int numPhysicalIntRegs;
96
97 /** Number of logical floating point registers. */
98 int numLogicalFloatRegs;
99
100 /** Number of physical floating point registers. */
101 int numPhysicalFloatRegs;
102
103 /** Number of miscellaneous registers. */
104 int numMiscRegs;
105
106 /** Number of logical integer + float registers. */
107 int numLogicalRegs;
108
109 /** Number of physical integer + float registers. */
110 int numPhysicalRegs;
111
112 /** The logical index of the zero register. */
113 int zeroRegIdx;
114
115 int currentSize;
116
117 void
118 resize(int newSize)
119 {
120 currentSize = newSize;
121 regScoreBoard.resize(newSize);
122 }
123
124 bool
125 indexInBounds(int idx)
126 {
127 return idx < currentSize;
128 }
129};
130
131#endif