1/*
2 * Copyright (c) 2003 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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49using namespace std;
50using namespace TheISA;
51
52PageTable::PageTable(System *_system, Addr _pageSize)
53 : pageSize(_pageSize), offsetMask(mask(floorLog2(_pageSize))),
54 system(_system)
55{
56 assert(isPowerOf2(pageSize));
57}
58
59PageTable::~PageTable()
60{
61}
62
63Fault
64PageTable::page_check(Addr addr, int size) const

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90
91void
92PageTable::allocate(Addr vaddr, int size)
93{
94 // starting address must be page aligned
95 assert(pageOffset(vaddr) == 0);
96
97 for (; size > 0; size -= pageSize, vaddr += pageSize) {
98 std::map<Addr,Addr>::iterator iter = pTable.find(vaddr);
99
100 if (iter != pTable.end()) {
101 // already mapped
102 fatal("PageTable::allocate: address 0x%x already mapped", vaddr);
103 }
104
105 pTable[vaddr] = system->new_page();
106 }
107}
108
109
110
111bool
112PageTable::translate(Addr vaddr, Addr &paddr)
113{
114 Addr page_addr = pageAlign(vaddr);
115 std::map<Addr,Addr>::iterator iter = pTable.find(page_addr);
116
117 if (iter == pTable.end()) {
118 return false;
119 }
120
121 paddr = iter->second + pageOffset(vaddr);
122 return true;
123}
124

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