DirectoryMemory.cc revision 11793 
1/*
2 * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
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 "mem/ruby/structures/DirectoryMemory.hh"
30
31#include "base/intmath.hh"
32#include "debug/RubyCache.hh"
33#include "debug/RubyStats.hh"
34#include "mem/ruby/slicc_interface/RubySlicc_Util.hh"
35#include "mem/ruby/system/RubySystem.hh"
36
37using namespace std;
38
39int DirectoryMemory::m_num_directories = 0;
40int DirectoryMemory::m_num_directories_bits = 0;
41int DirectoryMemory::m_numa_high_bit = 0;
42
43DirectoryMemory::DirectoryMemory(const Params *p)
44    : SimObject(p)
45{
46    m_version = p->version;
47    m_size_bytes = p->size;
48    m_size_bits = floorLog2(m_size_bytes);
49    m_num_entries = 0;
50    m_numa_high_bit = p->numa_high_bit;
51}
52
53void
54DirectoryMemory::init()
55{
56    m_num_entries = m_size_bytes / RubySystem::getBlockSizeBytes();
57    m_entries = new AbstractEntry*[m_num_entries];
58    for (int i = 0; i < m_num_entries; i++)
59        m_entries[i] = NULL;
60
61    m_num_directories++;
62    m_num_directories_bits = ceilLog2(m_num_directories);
63
64    if (m_numa_high_bit == 0) {
65        m_numa_high_bit = RubySystem::getMemorySizeBits() - 1;
66    }
67    assert(m_numa_high_bit != 0);
68}
69
70DirectoryMemory::~DirectoryMemory()
71{
72    // free up all the directory entries
73    for (uint64_t i = 0; i < m_num_entries; i++) {
74        if (m_entries[i] != NULL) {
75            delete m_entries[i];
76        }
77    }
78    delete [] m_entries;
79}
80
81uint64_t
82DirectoryMemory::mapAddressToDirectoryVersion(Addr address)
83{
84    if (m_num_directories_bits == 0)
85        return 0;
86
87    uint64_t ret = bitSelect(address,
88                           m_numa_high_bit - m_num_directories_bits + 1,
89                           m_numa_high_bit);
90    return ret;
91}
92
93bool
94DirectoryMemory::isPresent(Addr address)
95{
96    bool ret = (mapAddressToDirectoryVersion(address) == m_version);
97    return ret;
98}
99
100uint64_t
101DirectoryMemory::mapAddressToLocalIdx(Addr address)
102{
103    uint64_t ret;
104    if (m_num_directories_bits > 0) {
105        ret = bitRemove(address, m_numa_high_bit - m_num_directories_bits + 1,
106                        m_numa_high_bit);
107    } else {
108        ret = address;
109    }
110
111    return ret >> (RubySystem::getBlockSizeBits());
112}
113
114AbstractEntry*
115DirectoryMemory::lookup(Addr address)
116{
117    assert(isPresent(address));
118    DPRINTF(RubyCache, "Looking up address: %#x\n", address);
119
120    uint64_t idx = mapAddressToLocalIdx(address);
121    assert(idx < m_num_entries);
122    return m_entries[idx];
123}
124
125AbstractEntry*
126DirectoryMemory::allocate(Addr address, AbstractEntry *entry)
127{
128    assert(isPresent(address));
129    uint64_t idx;
130    DPRINTF(RubyCache, "Looking up address: %#x\n", address);
131
132    idx = mapAddressToLocalIdx(address);
133    assert(idx < m_num_entries);
134    entry->changePermission(AccessPermission_Read_Only);
135    m_entries[idx] = entry;
136
137    return entry;
138}
139
140void
141DirectoryMemory::print(ostream& out) const
142{
143}
144
145void
146DirectoryMemory::recordRequestType(DirectoryRequestType requestType) {
147    DPRINTF(RubyStats, "Recorded statistic: %s\n",
148            DirectoryRequestType_to_string(requestType));
149}
150
151DirectoryMemory *
152RubyDirectoryMemoryParams::create()
153{
154    return new DirectoryMemory(this);
155}
156