regfile.cc revision 9920:028e4da64b42 
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    : intRegFile(_numPhysicalIntRegs),
42      floatRegFile(_numPhysicalFloatRegs),
43      ccRegFile(_numPhysicalCCRegs),
44      baseFloatRegIndex(_numPhysicalIntRegs),
45      baseCCRegIndex(_numPhysicalIntRegs + _numPhysicalFloatRegs),
46      totalNumRegs(_numPhysicalIntRegs
47                   + _numPhysicalFloatRegs
48                   + _numPhysicalCCRegs)
49{
50    if (TheISA::NumCCRegs == 0 && _numPhysicalCCRegs != 0) {
51        // Just make this a warning and go ahead and allocate them
52        // anyway, to keep from having to add checks everywhere
53        warn("Non-zero number of physical CC regs specified, even though\n"
54             "    ISA does not use them.\n");
55    }
56}
57
58
59void
60PhysRegFile::initFreeList(UnifiedFreeList *freeList)
61{
62    // Initialize the free lists.
63    PhysRegIndex reg_idx = 0;
64
65    // The initial batch of registers are the integer ones
66    while (reg_idx < baseFloatRegIndex) {
67        freeList->addIntReg(reg_idx++);
68    }
69
70    // The next batch of the registers are the floating-point physical
71    // registers; put them onto the floating-point free list.
72    while (reg_idx < baseCCRegIndex) {
73        freeList->addFloatReg(reg_idx++);
74    }
75
76    // The rest of the registers are the condition-code physical
77    // registers; put them onto the condition-code free list.
78    while (reg_idx < totalNumRegs) {
79        freeList->addCCReg(reg_idx++);
80    }
81}
82