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
34 * Definitions of page table.
40 #include "arch/faults.hh"
41 #include "base/bitfield.hh"
42 #include "base/intmath.hh"
43 #include "base/trace.hh"
44 #include "mem/page_table.hh"
45 #include "sim/builder.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
));
59 PageTable::~PageTable()
64 PageTable::page_check(Addr addr
, int size
) const
66 if (size
< sizeof(uint64_t)) {
67 if (!isPowerOf2(size
)) {
68 panic("Invalid request size!\n");
69 return genMachineCheckFault();
72 if ((size
- 1) & addr
)
73 return genAlignmentFault();
76 if ((addr
& (VMPageSize
- 1)) + size
> VMPageSize
) {
77 panic("Invalid request size!\n");
78 return genMachineCheckFault();
81 if ((sizeof(uint64_t) - 1) & addr
)
82 return genAlignmentFault();
92 PageTable::allocate(Addr vaddr
, int size
)
94 // starting address must be page aligned
95 assert(pageOffset(vaddr
) == 0);
97 for (; size
> 0; size
-= pageSize
, vaddr
+= pageSize
) {
98 std::map
<Addr
,Addr
>::iterator iter
= pTable
.find(vaddr
);
100 if (iter
!= pTable
.end()) {
102 fatal("PageTable::allocate: address 0x%x already mapped", vaddr
);
105 pTable
[vaddr
] = system
->new_page();
112 PageTable::translate(Addr vaddr
, Addr
&paddr
)
114 Addr page_addr
= pageAlign(vaddr
);
115 std::map
<Addr
,Addr
>::iterator iter
= pTable
.find(page_addr
);
117 if (iter
== pTable
.end()) {
121 paddr
= iter
->second
+ pageOffset(vaddr
);
127 PageTable::translate(RequestPtr
&req
)
130 assert(pageAlign(req
->getVaddr() + req
->getSize() - 1)
131 == pageAlign(req
->getVaddr()));
132 if (!translate(req
->getVaddr(), paddr
)) {
133 return genMachineCheckFault();
135 req
->setPaddr(paddr
);
136 return page_check(req
->getPaddr(), req
->getSize());