summaryrefslogtreecommitdiff
path: root/src/mem/ruby/structures/DirectoryMemory.cc
blob: 04849e31f064eae4da42ae63b6dd32e6d758e2b8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*
 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "base/intmath.hh"
#include "debug/RubyCache.hh"
#include "debug/RubyStats.hh"
#include "mem/ruby/slicc_interface/RubySlicc_Util.hh"
#include "mem/ruby/structures/DirectoryMemory.hh"
#include "mem/ruby/system/System.hh"

using namespace std;

int DirectoryMemory::m_num_directories = 0;
int DirectoryMemory::m_num_directories_bits = 0;
uint64_t DirectoryMemory::m_total_size_bytes = 0;
int DirectoryMemory::m_numa_high_bit = 0;

DirectoryMemory::DirectoryMemory(const Params *p)
    : SimObject(p)
{
    m_version = p->version;
    m_size_bytes = p->size;
    m_size_bits = floorLog2(m_size_bytes);
    m_num_entries = 0;
    m_numa_high_bit = p->numa_high_bit;
}

void
DirectoryMemory::init()
{
    m_num_entries = m_size_bytes / RubySystem::getBlockSizeBytes();
    m_entries = new AbstractEntry*[m_num_entries];
    for (int i = 0; i < m_num_entries; i++)
        m_entries[i] = NULL;

    m_num_directories++;
    m_num_directories_bits = ceilLog2(m_num_directories);
    m_total_size_bytes += m_size_bytes;

    if (m_numa_high_bit == 0) {
        m_numa_high_bit = RubySystem::getMemorySizeBits() - 1;
    }
    assert(m_numa_high_bit != 0);
}

DirectoryMemory::~DirectoryMemory()
{
    // free up all the directory entries
    for (uint64 i = 0; i < m_num_entries; i++) {
        if (m_entries[i] != NULL) {
            delete m_entries[i];
        }
    }
    delete [] m_entries;
}

uint64
DirectoryMemory::mapAddressToDirectoryVersion(PhysAddress address)
{
    if (m_num_directories_bits == 0)
        return 0;

    uint64 ret = address.bitSelect(m_numa_high_bit - m_num_directories_bits + 1,
                                   m_numa_high_bit);
    return ret;
}

bool
DirectoryMemory::isPresent(PhysAddress address)
{
    bool ret = (mapAddressToDirectoryVersion(address) == m_version);
    return ret;
}

uint64
DirectoryMemory::mapAddressToLocalIdx(PhysAddress address)
{
    uint64 ret;
    if (m_num_directories_bits > 0) {
        ret = address.bitRemove(m_numa_high_bit - m_num_directories_bits + 1,
                                m_numa_high_bit);
    } else {
        ret = address.getAddress();
    }

    return ret >> (RubySystem::getBlockSizeBits());
}

AbstractEntry*
DirectoryMemory::lookup(PhysAddress address)
{
    assert(isPresent(address));
    DPRINTF(RubyCache, "Looking up address: %s\n", address);

    uint64_t idx = mapAddressToLocalIdx(address);
    assert(idx < m_num_entries);
    return m_entries[idx];
}

AbstractEntry*
DirectoryMemory::allocate(const PhysAddress& address, AbstractEntry* entry)
{
    assert(isPresent(address));
    uint64 idx;
    DPRINTF(RubyCache, "Looking up address: %s\n", address);

    idx = mapAddressToLocalIdx(address);
    assert(idx < m_num_entries);
    entry->changePermission(AccessPermission_Read_Only);
    m_entries[idx] = entry;

    return entry;
}

void
DirectoryMemory::print(ostream& out) const
{
}

void
DirectoryMemory::recordRequestType(DirectoryRequestType requestType) {
    DPRINTF(RubyStats, "Recorded statistic: %s\n",
            DirectoryRequestType_to_string(requestType));
}

DirectoryMemory *
RubyDirectoryMemoryParams::create()
{
    return new DirectoryMemory(this);
}