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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/*
* Copyright (c) 2014 Advanced Micro Devices, Inc.
* Copyright (c) 2003 The Regents of The University of Michigan
* 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.
*
* Authors: Steve Reinhardt
* Ron Dreslinski
* Ali Saidi
*/
/**
* @file
* Definitions of functional page table.
*/
#include "mem/page_table.hh"
#include <string>
#include "base/trace.hh"
#include "debug/MMU.hh"
#include "sim/faults.hh"
#include "sim/serialize.hh"
using namespace std;
void
EmulationPageTable::map(Addr vaddr, Addr paddr, int64_t size, uint64_t flags)
{
bool clobber = flags & Clobber;
// starting address must be page aligned
assert(pageOffset(vaddr) == 0);
DPRINTF(MMU, "Allocating Page: %#x-%#x\n", vaddr, vaddr + size);
while (size > 0) {
auto it = pTable.find(vaddr);
if (it != pTable.end()) {
// already mapped
panic_if(!clobber,
"EmulationPageTable::allocate: addr %#x already mapped",
vaddr);
it->second = Entry(paddr, flags);
} else {
pTable.emplace(vaddr, Entry(paddr, flags));
}
size -= pageSize;
vaddr += pageSize;
paddr += pageSize;
}
}
void
EmulationPageTable::remap(Addr vaddr, int64_t size, Addr new_vaddr)
{
assert(pageOffset(vaddr) == 0);
assert(pageOffset(new_vaddr) == 0);
DPRINTF(MMU, "moving pages from vaddr %08p to %08p, size = %d\n", vaddr,
new_vaddr, size);
while (size > 0) {
auto new_it = pTable.find(new_vaddr);
auto old_it = pTable.find(vaddr);
assert(old_it != pTable.end() && new_it == pTable.end());
new_it->second = old_it->second;
pTable.erase(old_it);
size -= pageSize;
vaddr += pageSize;
new_vaddr += pageSize;
}
}
void
EmulationPageTable::getMappings(std::vector<std::pair<Addr, Addr>> *addr_maps)
{
for (auto &iter : pTable)
addr_maps->push_back(make_pair(iter.first, iter.second.paddr));
}
void
EmulationPageTable::unmap(Addr vaddr, int64_t size)
{
assert(pageOffset(vaddr) == 0);
DPRINTF(MMU, "Unmapping page: %#x-%#x\n", vaddr, vaddr + size);
while (size > 0) {
auto it = pTable.find(vaddr);
assert(it != pTable.end());
pTable.erase(it);
size -= pageSize;
vaddr += pageSize;
}
}
bool
EmulationPageTable::isUnmapped(Addr vaddr, int64_t size)
{
// starting address must be page aligned
assert(pageOffset(vaddr) == 0);
for (int64_t offset = 0; offset < size; offset += pageSize)
if (pTable.find(vaddr + offset) != pTable.end())
return false;
return true;
}
const EmulationPageTable::Entry *
EmulationPageTable::lookup(Addr vaddr)
{
Addr page_addr = pageAlign(vaddr);
PTableItr iter = pTable.find(page_addr);
if (iter == pTable.end())
return nullptr;
return &(iter->second);
}
bool
EmulationPageTable::translate(Addr vaddr, Addr &paddr)
{
const Entry *entry = lookup(vaddr);
if (!entry) {
DPRINTF(MMU, "Couldn't Translate: %#x\n", vaddr);
return false;
}
paddr = pageOffset(vaddr) + entry->paddr;
DPRINTF(MMU, "Translating: %#x->%#x\n", vaddr, paddr);
return true;
}
Fault
EmulationPageTable::translate(RequestPtr req)
{
Addr paddr;
assert(pageAlign(req->getVaddr() + req->getSize() - 1) ==
pageAlign(req->getVaddr()));
if (!translate(req->getVaddr(), paddr))
return Fault(new GenericPageTableFault(req->getVaddr()));
req->setPaddr(paddr);
if ((paddr & (pageSize - 1)) + req->getSize() > pageSize) {
panic("Request spans page boundaries!\n");
return NoFault;
}
return NoFault;
}
void
EmulationPageTable::serialize(CheckpointOut &cp) const
{
paramOut(cp, "ptable.size", pTable.size());
PTable::size_type count = 0;
for (auto &pte : pTable) {
ScopedCheckpointSection sec(cp, csprintf("Entry%d", count++));
paramOut(cp, "vaddr", pte.first);
paramOut(cp, "paddr", pte.second.paddr);
paramOut(cp, "flags", pte.second.flags);
}
assert(count == pTable.size());
}
void
EmulationPageTable::unserialize(CheckpointIn &cp)
{
int count;
paramIn(cp, "ptable.size", count);
for (int i = 0; i < count; ++i) {
ScopedCheckpointSection sec(cp, csprintf("Entry%d", i));
Addr vaddr;
UNSERIALIZE_SCALAR(vaddr);
Addr paddr;
uint64_t flags;
UNSERIALIZE_SCALAR(paddr);
UNSERIALIZE_SCALAR(flags);
pTable.emplace(vaddr, Entry(paddr, flags));
}
}
|
