page_table.hh revision 2537 
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.
27 */
28
29/**
30 * @file
31 * Declaration of a non-full system Page Table.
32 */
33
34#ifndef __PAGE_TABLE__
35#define __PAGE_TABLE__
36
37#include <string>
38#include <map>
39
40#include "arch/isa_traits.hh"
41#include "base/trace.hh"
42#include "mem/request.hh"
43#include "mem/packet.hh"
44#include "sim/sim_object.hh"
45
46class System;
47
48/**
49 * Page Table Decleration.
50 */
51class PageTable
52{
53  protected:
54    std::map<Addr,Addr> pTable;
55
56    const Addr pageSize;
57    const Addr offsetMask;
58
59    System *system;
60
61  public:
62
63    PageTable(System *_system, Addr _pageSize = TheISA::VMPageSize);
64
65    ~PageTable();
66
67    Addr pageAlign(Addr a)  { return (a & ~offsetMask); }
68    Addr pageOffset(Addr a) { return (a &  offsetMask); }
69
70    Fault page_check(Addr addr, int size) const;
71
72    void allocate(Addr vaddr, int size);
73
74    /**
75     * Translate function
76     * @param vaddr The virtual address.
77     * @return Physical address from translation.
78     */
79    bool translate(Addr vaddr, Addr &paddr);
80
81    /**
82     * Perform a translation on the memory request, fills in paddr
83     * field of mem_req.
84     * @param req The memory request.
85     */
86    Fault translate(RequestPtr &req);
87
88};
89
90#endif
91