tlb.hh revision 3881 
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: Ali Saidi
29 */
30
31#ifndef __ARCH_SPARC_TLB_HH__
32#define __ARCH_SPARC_TLB_HH__
33
34#include "arch/sparc/asi.hh"
35#include "arch/sparc/tlb_map.hh"
36#include "base/misc.hh"
37#include "mem/request.hh"
38#include "sim/faults.hh"
39#include "sim/sim_object.hh"
40
41class ThreadContext;
42class Packet;
43
44namespace SparcISA
45{
46
47class TLB : public SimObject
48{
49  protected:
50    TlbMap lookupTable;;
51    typedef TlbMap::iterator MapIter;
52
53    TlbEntry *tlb;
54
55    int size;
56    int usedEntries;
57    int lastReplaced;
58
59    uint64_t cacheState;
60    bool cacheValid;
61
62    std::list<TlbEntry*> freeList;
63
64    enum FaultTypes {
65        OtherFault = 0,
66        PrivViolation = 0x1,
67        SideEffect = 0x2,
68        AtomicToIo = 0x4,
69        IllegalAsi = 0x8,
70        LoadFromNfo = 0x10,
71        VaOutOfRange = 0x20,
72        VaOutOfRangeJmp = 0x40
73    };
74
75    enum ContextType {
76        Primary = 0,
77        Secondary = 1,
78        Nucleus = 2
79    };
80
81
82    /** lookup an entry in the TLB based on the partition id, and real bit if
83     * real is true or the partition id, and context id if real is false.
84     * @param va the virtual address not shifted (e.g. bottom 13 bits are 0)
85     * @param paritition_id partition this entry is for
86     * @param real is this a real->phys or virt->phys translation
87     * @param context_id if this is virt->phys what context
88     * @return A pointer to a tlb entry
89     */
90    TlbEntry *lookup(Addr va, int partition_id, bool real, int context_id = 0);
91
92    /** Insert a PTE into the TLB. */
93    void insert(Addr vpn, int partition_id, int context_id, bool real,
94            const PageTableEntry& PTE, int entry = -1);
95
96    /** Given an entry id, read that tlb entries' tag. */
97    uint64_t TagRead(int entry);
98
99    /** Remove all entries from the TLB */
100    void invalidateAll();
101
102    /** Remove all non-locked entries from the tlb that match partition id. */
103    void demapAll(int partition_id);
104
105    /** Remove all entries that match a given context/partition id. */
106    void demapContext(int partition_id, int context_id);
107
108    /** Remve all entries that match a certain partition id, (contextid), and
109     * va). */
110    void demapPage(Addr va, int partition_id, bool real, int context_id);
111
112    /** Checks if the virtual address provided is a valid one. */
113    bool validVirtualAddress(Addr va, bool am);
114
115    void writeSfsr(ThreadContext *tc, int reg, bool write, ContextType ct,
116            bool se, FaultTypes ft, int asi);
117
118    void clearUsedBits();
119
120
121    void writeTagAccess(ThreadContext *tc, int reg, Addr va, int context);
122
123  public:
124    TLB(const std::string &name, int size);
125
126    void dumpAll();
127
128    // Checkpointing
129    virtual void serialize(std::ostream &os);
130    virtual void unserialize(Checkpoint *cp, const std::string &section);
131
132    /** Give an entry id, read that tlb entries' tte */
133    uint64_t TteRead(int entry);
134
135};
136
137class ITB : public TLB
138{
139  public:
140    ITB(const std::string &name, int size) : TLB(name, size)
141    {
142        cacheEntry = NULL;
143    }
144
145    Fault translate(RequestPtr &req, ThreadContext *tc);
146  private:
147    void writeSfsr(ThreadContext *tc, bool write, ContextType ct,
148            bool se, FaultTypes ft, int asi);
149    void writeTagAccess(ThreadContext *tc, Addr va, int context);
150    TlbEntry *cacheEntry;
151    friend class DTB;
152};
153
154class DTB : public TLB
155{
156  public:
157    DTB(const std::string &name, int size) : TLB(name, size)
158    {
159        cacheEntry[0] = NULL;
160        cacheEntry[1] = NULL;
161    }
162
163    Fault translate(RequestPtr &req, ThreadContext *tc, bool write);
164    Tick doMmuRegRead(ThreadContext *tc, Packet *pkt);
165    Tick doMmuRegWrite(ThreadContext *tc, Packet *pkt);
166
167  private:
168    void writeSfr(ThreadContext *tc, Addr a, bool write, ContextType ct,
169            bool se, FaultTypes ft, int asi);
170    void writeTagAccess(ThreadContext *tc, Addr va, int context);
171
172    TlbEntry *cacheEntry[2];
173    ASI cacheAsi[2];
174};
175
176}
177
178#endif // __ARCH_SPARC_TLB_HH__
179