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;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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29 */
30
31/**
32 * @file
33 * Declaration of a non-full system Page Table.
34 */
35
36#ifndef __PAGE_TABLE__
37#define __PAGE_TABLE__
38
39#include <string>
40#include <map>
41
42#include "arch/isa_traits.hh"
43#include "base/trace.hh"
44#include "mem/request.hh"
45#include "mem/packet.hh"
46#include "sim/sim_object.hh"
47
48class System;
49
50/**
51 * Page Table Decleration.
52 */
53class PageTable
54{
55 protected:
56 std::map<Addr,Addr> pTable;
57
58 const Addr pageSize;
59 const Addr offsetMask;
60
61 System *system;
62
63 public:
64
65 PageTable(System *_system, Addr _pageSize = TheISA::VMPageSize);
66
67 ~PageTable();
68
69 Addr pageAlign(Addr a) { return (a & ~offsetMask); }
70 Addr pageOffset(Addr a) { return (a & offsetMask); }
71
72 Fault page_check(Addr addr, int size) const;
73
74 void allocate(Addr vaddr, int size);
75
76 /**
77 * Translate function
78 * @param vaddr The virtual address.
79 * @return Physical address from translation.
80 */
81 bool translate(Addr vaddr, Addr &paddr);
82
83 /**
84 * Perform a translation on the memory request, fills in paddr
85 * field of mem_req.
86 * @param req The memory request.
87 */
88 Fault translate(RequestPtr &req);
89
90};
91
92#endif
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