1/*
2 * Copyright (c) 2005-2006 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: Korey Sewell
30 * Kevin Lim
31 * Steve Reinhardt
32 */
33
34#ifndef __CPU_O3_SCOREBOARD_HH__
35#define __CPU_O3_SCOREBOARD_HH__
36
37#include <iostream>
38#include <utility>
39#include <vector>
40
41#include "base/trace.hh"
42#include "config/the_isa.hh"
43#include "cpu/o3/comm.hh"
44#include "debug/Scoreboard.hh"
45
46/**
47 * Implements a simple scoreboard to track which registers are
48 * ready. This class operates on the unified physical register space,
| 1/*
2 * Copyright (c) 2005-2006 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: Korey Sewell
30 * Kevin Lim
31 * Steve Reinhardt
32 */
33
34#ifndef __CPU_O3_SCOREBOARD_HH__
35#define __CPU_O3_SCOREBOARD_HH__
36
37#include <iostream>
38#include <utility>
39#include <vector>
40
41#include "base/trace.hh"
42#include "config/the_isa.hh"
43#include "cpu/o3/comm.hh"
44#include "debug/Scoreboard.hh"
45
46/**
47 * Implements a simple scoreboard to track which registers are
48 * ready. This class operates on the unified physical register space,
|
49 * so integer and floating-point registers are not distinguished. For
50 * convenience, it also accepts operations on the physical-space
51 * mapping of misc registers, which are numbered starting after the
52 * end of the actual physical register file. However, there is no
53 * actual scoreboard for misc registers, and they are always
54 * considered ready.
| 49 * because the different classes of registers do not need to be distinguished.
50 * Registers being part of a fixed mapping are always considered ready.
|
55 */
56class Scoreboard
57{
58 private:
59 /** The object name, for DPRINTF. We have to declare this
60 * explicitly because Scoreboard is not a SimObject. */
61 const std::string _name;
62
63 /** Scoreboard of physical integer registers, saying whether or not they
64 * are ready. */
65 std::vector<bool> regScoreBoard;
66
67 /** The number of actual physical registers */
68 unsigned numPhysRegs;
69
| 51 */
52class Scoreboard
53{
54 private:
55 /** The object name, for DPRINTF. We have to declare this
56 * explicitly because Scoreboard is not a SimObject. */
57 const std::string _name;
58
59 /** Scoreboard of physical integer registers, saying whether or not they
60 * are ready. */
61 std::vector<bool> regScoreBoard;
62
63 /** The number of actual physical registers */
64 unsigned numPhysRegs;
65
|
70 /**
71 * The total number of registers which can be indexed, including
72 * the misc registers that come after the physical registers and
73 * which are hardwired to be always considered ready.
74 */
75 unsigned M5_CLASS_VAR_USED numTotalRegs;
76
77 /** The index of the zero register. */
78 PhysRegIndex zeroRegIdx;
79
80 /** The index of the FP zero register. */
81 PhysRegIndex fpZeroRegIdx;
82
83 bool isZeroReg(PhysRegIndex idx) const
84 {
85 return (idx == zeroRegIdx ||
86 (THE_ISA == ALPHA_ISA && idx == fpZeroRegIdx));
87 }
88
| |
89 public:
90 /** Constructs a scoreboard.
91 * @param _numPhysicalRegs Number of physical registers.
92 * @param _numMiscRegs Number of miscellaneous registers.
| 66 public:
67 /** Constructs a scoreboard.
68 * @param _numPhysicalRegs Number of physical registers.
69 * @param _numMiscRegs Number of miscellaneous registers.
|
93 * @param _zeroRegIdx Index of the zero register.
94 * @param _fpZeroRegIdx Index of the FP zero register (if any, currently
95 * used only for Alpha).
| |
96 */
97 Scoreboard(const std::string &_my_name,
| 70 */
71 Scoreboard(const std::string &_my_name,
|
98 unsigned _numPhysicalRegs,
99 unsigned _numMiscRegs,
100 PhysRegIndex _zeroRegIdx,
101 PhysRegIndex _fpZeroRegIdx);
| 72 unsigned _numPhysicalRegs);
|
102
103 /** Destructor. */
104 ~Scoreboard() {}
105
106 /** Returns the name of the scoreboard. */
107 std::string name() const { return _name; };
108
109 /** Checks if the register is ready. */
| 73
74 /** Destructor. */
75 ~Scoreboard() {}
76
77 /** Returns the name of the scoreboard. */
78 std::string name() const { return _name; };
79
80 /** Checks if the register is ready. */
|
110 bool getReg(PhysRegIndex reg_idx) const
| 81 bool getReg(PhysRegIdPtr phys_reg) const
|
111 {
| 82 {
|
112 assert(reg_idx < numTotalRegs);
| 83 assert(phys_reg->flatIdx < numPhysRegs);
|
113
| 84
|
114 if (reg_idx >= numPhysRegs) {
115 // misc regs are always ready
| 85 if (phys_reg->isFixedMapping()) {
86 // Fixed mapping regs are always ready
|
116 return true;
117 }
118
| 87 return true;
88 }
89
|
119 bool ready = regScoreBoard[reg_idx];
| 90 bool ready = regScoreBoard[phys_reg->flatIdx];
|
120
| 91
|
121 if (isZeroReg(reg_idx))
| 92 if (phys_reg->isZeroReg())
|
122 assert(ready);
123
124 return ready;
125 }
126
127 /** Sets the register as ready. */
| 93 assert(ready);
94
95 return ready;
96 }
97
98 /** Sets the register as ready. */
|
128 void setReg(PhysRegIndex reg_idx)
| 99 void setReg(PhysRegIdPtr phys_reg)
|
129 {
| 100 {
|
130 assert(reg_idx < numTotalRegs);
| 101 assert(phys_reg->flatIdx < numPhysRegs);
|
131
| 102
|
132 if (reg_idx >= numPhysRegs) {
133 // misc regs are always ready, ignore attempts to change that
| 103 if (phys_reg->isFixedMapping()) {
104 // Fixed mapping regs are always ready, ignore attempts to change
105 // that
|
134 return;
135 }
136
| 106 return;
107 }
108
|
137 DPRINTF(Scoreboard, "Setting reg %i as ready\n", reg_idx);
| 109 DPRINTF(Scoreboard, "Setting reg %i (%s) as ready\n", phys_reg->regIdx,
110 RegClassStrings[phys_reg->regClass]);
|
138
| 111
|
139 assert(reg_idx < numTotalRegs);
140 regScoreBoard[reg_idx] = true;
| 112 regScoreBoard[phys_reg->flatIdx] = true;
|
141 }
142
143 /** Sets the register as not ready. */
| 113 }
114
115 /** Sets the register as not ready. */
|
144 void unsetReg(PhysRegIndex reg_idx)
| 116 void unsetReg(PhysRegIdPtr phys_reg)
|
145 {
| 117 {
|
146 assert(reg_idx < numTotalRegs);
| 118 assert(phys_reg->flatIdx < numPhysRegs);
|
147
| 119
|
148 if (reg_idx >= numPhysRegs) {
149 // misc regs are always ready, ignore attempts to change that
| 120 if (phys_reg->isFixedMapping()) {
121 // Fixed mapping regs are always ready, ignore attempts to
122 // change that
|
150 return;
151 }
152
153 // zero reg should never be marked unready
| 123 return;
124 }
125
126 // zero reg should never be marked unready
|
154 if (isZeroReg(reg_idx))
| 127 if (phys_reg->isZeroReg())
|
155 return;
156
| 128 return;
129
|
157 regScoreBoard[reg_idx] = false;
| 130 regScoreBoard[phys_reg->flatIdx] = false;
|
158 }
159
160};
161
162#endif
| 131 }
132
133};
134
135#endif
|