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 "arch/faults.hh"
42 #include "base/bitfield.hh"
43 #include "base/intmath.hh"
44 #include "base/trace.hh"
45 #include "mem/page_table.hh"
46 #include "sim/sim_object.hh"
47 #include "sim/system.hh"
50 using namespace TheISA
;
52 PageTable::PageTable(System
*_system
, Addr _pageSize
)
53 : pageSize(_pageSize
), offsetMask(mask(floorLog2(_pageSize
))),
56 assert(isPowerOf2(pageSize
));
57 pTableCache
[0].vaddr
= 0;
58 pTableCache
[1].vaddr
= 0;
59 pTableCache
[2].vaddr
= 0;
62 PageTable::~PageTable()
67 PageTable::allocate(Addr vaddr
, int64_t size
)
69 // starting address must be page aligned
70 assert(pageOffset(vaddr
) == 0);
72 DPRINTF(MMU
, "Allocating Page: %#x-%#x\n", vaddr
, vaddr
+ size
);
74 for (; size
> 0; size
-= pageSize
, vaddr
+= pageSize
) {
75 PTableItr iter
= pTable
.find(vaddr
);
77 if (iter
!= pTable
.end()) {
79 fatal("PageTable::allocate: address 0x%x already mapped",
83 pTable
[vaddr
] = TheISA::TlbEntry(system
->new_page());
84 updateCache(vaddr
, pTable
[vaddr
]);
89 PageTable::lookup(Addr vaddr
, TheISA::TlbEntry
&entry
)
91 Addr page_addr
= pageAlign(vaddr
);
93 if (pTableCache
[0].vaddr
== page_addr
) {
94 entry
= pTableCache
[0].entry
;
97 if (pTableCache
[1].vaddr
== page_addr
) {
98 entry
= pTableCache
[1].entry
;
101 if (pTableCache
[2].vaddr
== page_addr
) {
102 entry
= pTableCache
[2].entry
;
106 PTableItr iter
= pTable
.find(page_addr
);
108 if (iter
== pTable
.end()) {
112 updateCache(page_addr
, iter
->second
);
113 entry
= iter
->second
;
118 PageTable::translate(Addr vaddr
, Addr
&paddr
)
120 TheISA::TlbEntry entry
;
121 if (!lookup(vaddr
, entry
)) {
122 DPRINTF(MMU
, "Couldn't Translate: %#x\n", vaddr
);
125 paddr
= pageOffset(vaddr
) + entry
.pageStart
;
126 DPRINTF(MMU
, "Translating: %#x->%#x\n", vaddr
, paddr
);
131 PageTable::translate(RequestPtr req
)
134 assert(pageAlign(req
->getVaddr() + req
->getSize() - 1)
135 == pageAlign(req
->getVaddr()));
136 if (!translate(req
->getVaddr(), paddr
)) {
137 return Fault(new GenericPageTableFault(req
->getVaddr()));
139 req
->setPaddr(paddr
);
140 if ((paddr
& (pageSize
- 1)) + req
->getSize() > pageSize
) {
141 panic("Request spans page boundaries!\n");
148 PageTable::serialize(std::ostream
&os
)
150 paramOut(os
, "ptable.size", pTable
.size());
154 PTableItr iter
= pTable
.begin();
155 PTableItr end
= pTable
.end();
156 while (iter
!= end
) {
157 os
<< "\n[" << csprintf("%s.Entry%d", name(), count
) << "]\n";
159 paramOut(os
, "vaddr", iter
->first
);
160 iter
->second
.serialize(os
);
165 assert(count
== pTable
.size());
169 PageTable::unserialize(Checkpoint
*cp
, const std::string
§ion
)
172 paramIn(cp
, section
, "ptable.size", count
);
174 TheISA::TlbEntry
*entry
;
179 paramIn(cp
, csprintf("%s.Entry%d", name(), i
), "vaddr", vaddr
);
180 entry
= new TheISA::TlbEntry();
181 entry
->unserialize(cp
, csprintf("%s.Entry%d", name(), i
));
182 pTable
[vaddr
] = *entry
;