tlb.hh revision 7781 
1/*
2 * Copyright (c) 2006 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 * Authors: Gabe Black
29 */
30
31#ifndef __SIM_TLB_HH__
32#define __SIM_TLB_HH__
33
34#include "base/misc.hh"
35#include "mem/request.hh"
36#include "sim/fault.hh"
37#include "sim/sim_object.hh"
38
39class ThreadContext;
40class Packet;
41class Port;
42
43class BaseTLB : public SimObject
44{
45  protected:
46    BaseTLB(const Params *p)
47        : SimObject(p)
48    {}
49
50  public:
51    enum Mode { Read, Write, Execute };
52
53  public:
54    virtual void demapPage(Addr vaddr, uint64_t asn) = 0;
55
56    /** Get any port that the TLB or hardware table walker needs.
57     * This is used for migrating port connections during a takeOverFrom()
58     * call. */
59    virtual Port*  getPort() { return NULL; }
60
61    class Translation
62    {
63      public:
64        virtual ~Translation()
65        {}
66
67        /*
68         * The memory for this object may be dynamically allocated, and it may
69         * be responsible for cleaning itself up which will happen in this
70         * function. Once it's called, the object is no longer valid.
71         */
72        virtual void finish(Fault fault, RequestPtr req, ThreadContext *tc,
73                            Mode mode) = 0;
74    };
75};
76
77class GenericTLB : public BaseTLB
78{
79  protected:
80    GenericTLB(const Params *p)
81        : BaseTLB(p)
82    {}
83
84  public:
85    void demapPage(Addr vaddr, uint64_t asn);
86
87    Fault translateAtomic(RequestPtr req, ThreadContext *tc, Mode mode);
88    void translateTiming(RequestPtr req, ThreadContext *tc,
89                         Translation *translation, Mode mode);
90};
91
92#endif // __ARCH_SPARC_TLB_HH__
93