Address.cc revision 11118 
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
31#include "mem/ruby/system/RubySystem.hh"
32
33Addr
34bitSelect(Addr addr, unsigned int small, unsigned int big)
35{
36    assert(big >= small);
37
38    if (big >= ADDRESS_WIDTH - 1) {
39        return (addr >> small);
40    } else {
41        Addr mask = ~((Addr)~0 << (big + 1));
42        // FIXME - this is slow to manipulate a 64-bit number using 32-bits
43        Addr partial = (addr & mask);
44        return (partial >> small);
45    }
46}
47
48Addr
49bitRemove(Addr addr, unsigned int small, unsigned int big)
50{
51    assert(big >= small);
52
53    if (small >= ADDRESS_WIDTH - 1) {
54        return addr;
55    } else if (big >= ADDRESS_WIDTH - 1) {
56        Addr mask = (Addr)~0 >> small;
57        return (addr & mask);
58    } else if (small == 0) {
59        Addr mask = (Addr)~0 << big;
60        return (addr & mask);
61    } else {
62        Addr mask = ~((Addr)~0 << small);
63        Addr lower_bits = addr & mask;
64        mask = (Addr)~0 << (big + 1);
65        Addr higher_bits = addr & mask;
66
67        // Shift the valid high bits over the removed section
68        higher_bits = higher_bits >> (big - small + 1);
69        return (higher_bits | lower_bits);
70    }
71}
72
73Addr
74maskLowOrderBits(Addr addr, unsigned int number)
75{
76  Addr mask;
77
78  if (number >= ADDRESS_WIDTH - 1) {
79      mask = ~0;
80  } else {
81      mask = (Addr)~0 << number;
82  }
83  return (addr & mask);
84}
85
86Addr
87maskHighOrderBits(Addr addr, unsigned int number)
88{
89    Addr mask;
90
91    if (number >= ADDRESS_WIDTH - 1) {
92        mask = ~0;
93    } else {
94        mask = (Addr)~0 >> number;
95    }
96    return (addr & mask);
97}
98
99Addr
100shiftLowOrderBits(Addr addr, unsigned int number)
101{
102    return (addr >> number);
103}
104
105Addr
106getOffset(Addr addr)
107{
108    return bitSelect(addr, 0, RubySystem::getBlockSizeBits() - 1);
109}
110
111Addr
112makeLineAddress(Addr addr)
113{
114    return maskLowOrderBits(addr, RubySystem::getBlockSizeBits());
115}
116
117// returns the next stride address based on line address
118Addr
119makeNextStrideAddress(Addr addr, int stride)
120{
121    return maskLowOrderBits(addr, RubySystem::getBlockSizeBits())
122        + RubySystem::getBlockSizeBytes() * stride;
123}
124
125std::string
126printAddress(Addr addr)
127{
128    std::stringstream out;
129    out << "[" << std::hex << "0x" << addr << "," << " line 0x"
130       << maskLowOrderBits(addr, RubySystem::getBlockSizeBits())
131       << std::dec << "]";
132    return out.str();
133}
134