scoreboard.cc revision 2669:f2b336e89d2a 
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
29#include "cpu/o3/scoreboard.hh"
30
31Scoreboard::Scoreboard(unsigned activeThreads,
32                       unsigned _numLogicalIntRegs,
33                       unsigned _numPhysicalIntRegs,
34                       unsigned _numLogicalFloatRegs,
35                       unsigned _numPhysicalFloatRegs,
36                       unsigned _numMiscRegs,
37                       unsigned _zeroRegIdx)
38    : numLogicalIntRegs(_numLogicalIntRegs),
39      numPhysicalIntRegs(_numPhysicalIntRegs),
40      numLogicalFloatRegs(_numLogicalFloatRegs),
41      numPhysicalFloatRegs(_numPhysicalFloatRegs),
42      numMiscRegs(_numMiscRegs),
43      zeroRegIdx(_zeroRegIdx)
44{
45    //Get Register Sizes
46    numLogicalRegs = numLogicalIntRegs  + numLogicalFloatRegs;
47    numPhysicalRegs = numPhysicalIntRegs  + numPhysicalFloatRegs;
48
49    //Resize scoreboard appropriately
50    regScoreBoard.resize(numPhysicalRegs + (numMiscRegs * activeThreads));
51
52    //Initialize values
53    for (int i=0; i < numLogicalIntRegs * activeThreads; i++) {
54        regScoreBoard[i] = 1;
55    }
56
57    for (int i= numPhysicalIntRegs;
58         i < numPhysicalIntRegs + (numLogicalFloatRegs * activeThreads);
59         i++) {
60        regScoreBoard[i] = 1;
61    }
62
63    for (int i = numPhysicalRegs;
64         i < numPhysicalRegs + (numMiscRegs * activeThreads);
65         i++) {
66        regScoreBoard[i] = 1;
67    }
68}
69
70std::string
71Scoreboard::name() const
72{
73    return "cpu.scoreboard";
74}
75
76bool
77Scoreboard::getReg(PhysRegIndex phys_reg)
78{
79    // Always ready if int or fp zero reg.
80    if (phys_reg == zeroRegIdx ||
81        phys_reg == (zeroRegIdx + numPhysicalIntRegs)) {
82        return 1;
83    }
84
85    return regScoreBoard[phys_reg];
86}
87
88void
89Scoreboard::setReg(PhysRegIndex phys_reg)
90{
91    DPRINTF(Scoreboard, "Setting reg %i as ready\n", phys_reg);
92
93    regScoreBoard[phys_reg] = 1;
94}
95
96void
97Scoreboard::unsetReg(PhysRegIndex ready_reg)
98{
99    if (ready_reg == zeroRegIdx ||
100        ready_reg == (zeroRegIdx + numPhysicalIntRegs)) {
101        // Don't do anything if int or fp zero reg.
102        return;
103    }
104
105    regScoreBoard[ready_reg] = 0;
106}
107