regfile.cc revision 10934:5af8f40d8f2c 
1/*
2 * Copyright (c) 2004-2005 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: Kevin Lim
30 *          Gabe Black
31 *          Steve Reinhardt
32 */
33
34#include "cpu/o3/free_list.hh"
35#include "cpu/o3/regfile.hh"
36
37
38PhysRegFile::PhysRegFile(unsigned _numPhysicalIntRegs,
39                         unsigned _numPhysicalFloatRegs,
40                         unsigned _numPhysicalCCRegs,
41                         unsigned _numPhysicalVectorRegs)
42    : intRegFile(_numPhysicalIntRegs),
43      floatRegFile(_numPhysicalFloatRegs),
44      ccRegFile(_numPhysicalCCRegs),
45      vectorRegFile(_numPhysicalVectorRegs),
46      baseFloatRegIndex(_numPhysicalIntRegs),
47      baseCCRegIndex(_numPhysicalIntRegs + _numPhysicalFloatRegs),
48      baseVectorRegIndex(_numPhysicalIntRegs + _numPhysicalFloatRegs
49              + _numPhysicalCCRegs),
50      totalNumRegs(_numPhysicalIntRegs
51                   + _numPhysicalFloatRegs
52                   + _numPhysicalCCRegs
53                   + _numPhysicalVectorRegs)
54{
55    if (TheISA::NumCCRegs == 0 && _numPhysicalCCRegs != 0) {
56        // Just make this a warning and go ahead and allocate them
57        // anyway, to keep from having to add checks everywhere
58        warn("Non-zero number of physical CC regs specified, even though\n"
59             "    ISA does not use them.\n");
60    }
61
62    if (TheISA::NumVectorRegs == 0 && _numPhysicalVectorRegs != 0) {
63        // Just make this a warning and go ahead and allocate them
64        // anyway, to keep from having to add checks everywhere
65        warn("Non-zero number of physical vector regs specified, even though\n"
66             "    ISA does not use them.\n");
67    }
68}
69
70
71void
72PhysRegFile::initFreeList(UnifiedFreeList *freeList)
73{
74    // Initialize the free lists.
75    PhysRegIndex reg_idx = 0;
76
77    // The initial batch of registers are the integer ones
78    while (reg_idx < baseFloatRegIndex) {
79        freeList->addIntReg(reg_idx++);
80    }
81
82    // The next batch of the registers are the floating-point physical
83    // registers; put them onto the floating-point free list.
84    while (reg_idx < baseCCRegIndex) {
85        freeList->addFloatReg(reg_idx++);
86    }
87
88    // The next batch of registers are the condition-code physical
89    // registers; put them onto the condition-code free list.
90    while (reg_idx < baseVectorRegIndex) {
91        freeList->addCCReg(reg_idx++);
92    }
93
94    // The rest of the registers are the vector physical
95    // registers; put them onto the vector free list.
96    while (reg_idx < totalNumRegs) {
97        freeList->addVectorReg(reg_idx++);
98    }
99}
100