tlb.hh revision 7944 
1/*
2 * Copyright (c) 2011 ARM Limited
3 * All rights reserved.
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2006 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Gabe Black
41 */
42
43#ifndef __SIM_TLB_HH__
44#define __SIM_TLB_HH__
45
46#include "base/misc.hh"
47#include "mem/request.hh"
48#include "sim/fault_fwd.hh"
49#include "sim/sim_object.hh"
50
51class ThreadContext;
52class Packet;
53class Port;
54
55class BaseTLB : public SimObject
56{
57  protected:
58    BaseTLB(const Params *p)
59        : SimObject(p)
60    {}
61
62  public:
63    enum Mode { Read, Write, Execute };
64
65  public:
66    virtual void demapPage(Addr vaddr, uint64_t asn) = 0;
67
68    /** Get any port that the TLB or hardware table walker needs.
69     * This is used for migrating port connections during a takeOverFrom()
70     * call. */
71    virtual Port*  getPort() { return NULL; }
72
73    class Translation
74    {
75      public:
76        virtual ~Translation()
77        {}
78
79        /**
80         * Signal that the translation has been delayed due to a hw page table
81         * walk.
82         */
83        virtual void markDelayed() = 0;
84
85        /*
86         * The memory for this object may be dynamically allocated, and it may
87         * be responsible for cleaning itself up which will happen in this
88         * function. Once it's called, the object is no longer valid.
89         */
90        virtual void finish(Fault fault, RequestPtr req, ThreadContext *tc,
91                            Mode mode) = 0;
92    };
93};
94
95class GenericTLB : public BaseTLB
96{
97  protected:
98    GenericTLB(const Params *p)
99        : BaseTLB(p)
100    {}
101
102  public:
103    void demapPage(Addr vaddr, uint64_t asn);
104
105    Fault translateAtomic(RequestPtr req, ThreadContext *tc, Mode mode);
106    void translateTiming(RequestPtr req, ThreadContext *tc,
107                         Translation *translation, Mode mode);
108};
109
110#endif // __ARCH_SPARC_TLB_HH__
111