Address.cc revision 8091:04078b1214dd 
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/common/Address.hh"
30#include "mem/ruby/system/System.hh"
31
32physical_address_t
33Address::getLineAddress() const
34{
35    return bitSelect(RubySystem::getBlockSizeBits(), ADDRESS_WIDTH);
36}
37
38physical_address_t
39Address::getOffset() const
40{
41    return bitSelect(0, RubySystem::getBlockSizeBits() - 1);
42}
43
44void
45Address::makeLineAddress()
46{
47    m_address = maskLowOrderBits(RubySystem::getBlockSizeBits());
48}
49
50// returns the next stride address based on line address
51void
52Address::makeNextStrideAddress(int stride)
53{
54    m_address = maskLowOrderBits(RubySystem::getBlockSizeBits())
55        + RubySystem::getBlockSizeBytes()*stride;
56}
57
58integer_t
59Address::memoryModuleIndex() const
60{
61    integer_t index =
62        bitSelect(RubySystem::getBlockSizeBits() +
63                  RubySystem::getMemorySizeBits(), ADDRESS_WIDTH);
64    assert (index >= 0);
65    return index;
66
67    // Index indexHighPortion =
68    //     address.bitSelect(MEMORY_SIZE_BITS - 1,
69    //                       PAGE_SIZE_BITS + NUMBER_OF_MEMORY_MODULE_BITS);
70    // Index indexLowPortion =
71    //     address.bitSelect(DATA_BLOCK_BITS, PAGE_SIZE_BITS - 1);
72    //
73    // Index index = indexLowPortion |
74    //     (indexHighPortion << (PAGE_SIZE_BITS - DATA_BLOCK_BITS));
75
76    /*
77      Round-robin mapping of addresses, at page size granularity
78
79ADDRESS_WIDTH    MEMORY_SIZE_BITS        PAGE_SIZE_BITS  DATA_BLOCK_BITS
80  |                    |                       |               |
81 \ /                  \ /                     \ /             \ /       0
82  -----------------------------------------------------------------------
83  |       unused        |xxxxxxxxxxxxxxx|       |xxxxxxxxxxxxxxx|       |
84  |                     |xxxxxxxxxxxxxxx|       |xxxxxxxxxxxxxxx|       |
85  -----------------------------------------------------------------------
86                        indexHighPortion         indexLowPortion
87                                        <------->
88                               NUMBER_OF_MEMORY_MODULE_BITS
89    */
90}
91
92void
93Address::print(std::ostream& out) const
94{
95    using namespace std;
96    out << "[" << hex << "0x" << m_address << "," << " line 0x"
97        << maskLowOrderBits(RubySystem::getBlockSizeBits()) << dec << "]"
98        << flush;
99}
100
101void
102Address::output(std::ostream& out) const
103{
104    // Note: this outputs addresses in the form "ffff", not "0xffff".
105    // This code should always be able to write out addresses in a
106    // format that can be read in by the below input() method.  Please
107    // don't change this without talking to Milo first.
108    out << std::hex << m_address << std::dec;
109}
110
111void
112Address::input(std::istream& in)
113{
114    // Note: this only works with addresses in the form "ffff", not
115    // "0xffff".  This code should always be able to read in addresses
116    // written out by the above output() method.  Please don't change
117    // this without talking to Milo first.
118    in >> std::hex >> m_address >> std::dec;
119}
120
121Address::Address(const Address& obj)
122{
123    m_address = obj.m_address;
124}
125
126Address&
127Address::operator=(const Address& obj)
128{
129    if (this == &obj) {
130        // assert(false);
131    } else {
132        m_address = obj.m_address;
133    }
134    return *this;
135}
136
137