2 * Copyright (c) 2003 The Regents of The University of Michigan
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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28 * Authors: Steve Reinhardt
35 * Definitions of page table.
41 #include "base/bitfield.hh"
42 #include "base/intmath.hh"
43 #include "base/trace.hh"
44 #include "config/the_isa.hh"
45 #include "mem/page_table.hh"
46 #include "sim/faults.hh"
47 #include "sim/process.hh"
48 #include "sim/sim_object.hh"
49 #include "sim/system.hh"
52 using namespace TheISA
;
54 PageTable::PageTable(Process
*_process
, Addr _pageSize
)
55 : pageSize(_pageSize
), offsetMask(mask(floorLog2(_pageSize
))),
58 assert(isPowerOf2(pageSize
));
59 pTableCache
[0].vaddr
= 0;
60 pTableCache
[1].vaddr
= 0;
61 pTableCache
[2].vaddr
= 0;
64 PageTable::~PageTable()
69 PageTable::allocate(Addr vaddr
, int64_t size
)
71 // starting address must be page aligned
72 assert(pageOffset(vaddr
) == 0);
74 DPRINTF(MMU
, "Allocating Page: %#x-%#x\n", vaddr
, vaddr
+ size
);
76 for (; size
> 0; size
-= pageSize
, vaddr
+= pageSize
) {
77 PTableItr iter
= pTable
.find(vaddr
);
79 if (iter
!= pTable
.end()) {
81 fatal("PageTable::allocate: address 0x%x already mapped",
85 pTable
[vaddr
] = TheISA::TlbEntry(process
->M5_pid
, vaddr
,
86 process
->system
->new_page());
87 updateCache(vaddr
, pTable
[vaddr
]);
92 PageTable::remap(Addr vaddr
, int64_t size
, Addr new_vaddr
)
94 assert(pageOffset(vaddr
) == 0);
95 assert(pageOffset(new_vaddr
) == 0);
97 DPRINTF(MMU
, "moving pages from vaddr %08p to %08p, size = %d\n", vaddr
,
100 for (; size
> 0; size
-= pageSize
, vaddr
+= pageSize
, new_vaddr
+= pageSize
) {
101 PTableItr iter
= pTable
.find(vaddr
);
103 assert(iter
!= pTable
.end());
105 pTable
[new_vaddr
] = pTable
[vaddr
];
107 pTable
[new_vaddr
].updateVaddr(new_vaddr
);
108 updateCache(new_vaddr
, pTable
[new_vaddr
]);
113 PageTable::deallocate(Addr vaddr
, int64_t size
)
115 assert(pageOffset(vaddr
) == 0);
117 DPRINTF(MMU
, "Deallocating page: %#x-%#x\n", vaddr
, vaddr
+ size
);
119 for (; size
> 0; size
-= pageSize
, vaddr
+= pageSize
) {
120 PTableItr iter
= pTable
.find(vaddr
);
122 assert(iter
!= pTable
.end());
130 PageTable::lookup(Addr vaddr
, TheISA::TlbEntry
&entry
)
132 Addr page_addr
= pageAlign(vaddr
);
134 if (pTableCache
[0].vaddr
== page_addr
) {
135 entry
= pTableCache
[0].entry
;
138 if (pTableCache
[1].vaddr
== page_addr
) {
139 entry
= pTableCache
[1].entry
;
142 if (pTableCache
[2].vaddr
== page_addr
) {
143 entry
= pTableCache
[2].entry
;
147 PTableItr iter
= pTable
.find(page_addr
);
149 if (iter
== pTable
.end()) {
153 updateCache(page_addr
, iter
->second
);
154 entry
= iter
->second
;
159 PageTable::translate(Addr vaddr
, Addr
&paddr
)
161 TheISA::TlbEntry entry
;
162 if (!lookup(vaddr
, entry
)) {
163 DPRINTF(MMU
, "Couldn't Translate: %#x\n", vaddr
);
166 paddr
= pageOffset(vaddr
) + entry
.pageStart();
167 DPRINTF(MMU
, "Translating: %#x->%#x\n", vaddr
, paddr
);
172 PageTable::translate(RequestPtr req
)
175 assert(pageAlign(req
->getVaddr() + req
->getSize() - 1)
176 == pageAlign(req
->getVaddr()));
177 if (!translate(req
->getVaddr(), paddr
)) {
178 return Fault(new GenericPageTableFault(req
->getVaddr()));
180 req
->setPaddr(paddr
);
181 if ((paddr
& (pageSize
- 1)) + req
->getSize() > pageSize
) {
182 panic("Request spans page boundaries!\n");
189 PageTable::serialize(std::ostream
&os
)
191 paramOut(os
, "ptable.size", pTable
.size());
193 PTable::size_type count
= 0;
195 PTableItr iter
= pTable
.begin();
196 PTableItr end
= pTable
.end();
197 while (iter
!= end
) {
198 os
<< "\n[" << csprintf("%s.Entry%d", process
->name(), count
) << "]\n";
200 paramOut(os
, "vaddr", iter
->first
);
201 iter
->second
.serialize(os
);
206 assert(count
== pTable
.size());
210 PageTable::unserialize(Checkpoint
*cp
, const std::string
§ion
)
213 paramIn(cp
, section
, "ptable.size", count
);
215 TheISA::TlbEntry
*entry
;
220 paramIn(cp
, csprintf("%s.Entry%d", process
->name(), i
), "vaddr", vaddr
);
221 entry
= new TheISA::TlbEntry();
222 entry
->unserialize(cp
, csprintf("%s.Entry%d", process
->name(), i
));
223 pTable
[vaddr
] = *entry
;