2 * Copyright (c) 2003 The Regents of The University of Michigan
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31 * Definitions of page table.
37 #include "arch/faults.hh"
38 #include "base/bitfield.hh"
39 #include "base/intmath.hh"
40 #include "base/trace.hh"
41 #include "mem/page_table.hh"
42 #include "sim/builder.hh"
43 #include "sim/sim_object.hh"
44 #include "sim/system.hh"
47 using namespace TheISA
;
49 PageTable::PageTable(System
*_system
, Addr _pageSize
)
50 : pageSize(_pageSize
), offsetMask(mask(floorLog2(_pageSize
))),
53 assert(isPowerOf2(pageSize
));
56 PageTable::~PageTable()
61 PageTable::page_check(Addr addr
, int size
) const
63 if (size
< sizeof(uint64_t)) {
64 if (!isPowerOf2(size
)) {
65 panic("Invalid request size!\n");
66 return genMachineCheckFault();
69 if ((size
- 1) & addr
)
70 return genAlignmentFault();
73 if ((addr
& (VMPageSize
- 1)) + size
> VMPageSize
) {
74 panic("Invalid request size!\n");
75 return genMachineCheckFault();
78 if ((sizeof(uint64_t) - 1) & addr
)
79 return genAlignmentFault();
89 PageTable::allocate(Addr vaddr
, int size
)
91 // starting address must be page aligned
92 assert(pageOffset(vaddr
) == 0);
94 for (; size
> 0; size
-= pageSize
, vaddr
+= pageSize
) {
95 std::map
<Addr
,Addr
>::iterator iter
= pTable
.find(vaddr
);
97 if (iter
!= pTable
.end()) {
99 fatal("PageTable::allocate: address 0x%x already mapped", vaddr
);
102 pTable
[vaddr
] = system
->new_page();
109 PageTable::translate(Addr vaddr
, Addr
&paddr
)
111 Addr page_addr
= pageAlign(vaddr
);
112 std::map
<Addr
,Addr
>::iterator iter
= pTable
.find(page_addr
);
114 if (iter
== pTable
.end()) {
118 paddr
= iter
->second
+ pageOffset(vaddr
);
124 PageTable::translate(CpuRequestPtr
&req
)
126 assert(pageAlign(req
->vaddr
+ req
->size
- 1) == pageAlign(req
->vaddr
));
127 if (!translate(req
->vaddr
, req
->paddr
)) {
128 return genMachineCheckFault();
130 return page_check(req
->paddr
, req
->size
);