tlb.hh revision 2090 
1/*
2 * Copyright (c) 2001-2005 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#ifndef __ALPHA_MEMORY_HH__
30#define __ALPHA_MEMORY_HH__
31
32#include <map>
33
34#include "arch/alpha/isa_traits.hh"
35#include "arch/alpha/faults.hh"
36#include "base/statistics.hh"
37#include "mem/mem_req.hh"
38#include "sim/sim_object.hh"
39
40class ExecContext;
41
42class AlphaTLB : public SimObject
43{
44  protected:
45    typedef std::multimap<Addr, int> PageTable;
46    PageTable lookupTable;	// Quick lookup into page table
47
48    AlphaISA::PTE *table;	// the Page Table
49    int size;			// TLB Size
50    int nlu;			// not last used entry (for replacement)
51
52    void nextnlu() { if (++nlu >= size) nlu = 0; }
53    AlphaISA::PTE *lookup(Addr vpn, uint8_t asn) const;
54
55  public:
56    AlphaTLB(const std::string &name, int size);
57    virtual ~AlphaTLB();
58
59    int getsize() const { return size; }
60
61    AlphaISA::PTE &index(bool advance = true);
62    void insert(Addr vaddr, AlphaISA::PTE &pte);
63
64    void flushAll();
65    void flushProcesses();
66    void flushAddr(Addr addr, uint8_t asn);
67
68    // static helper functions... really EV5 VM traits
69    static bool validVirtualAddress(Addr vaddr) {
70        // unimplemented bits must be all 0 or all 1
71        Addr unimplBits = vaddr & EV5::VAddrUnImplMask;
72        return (unimplBits == 0) || (unimplBits == EV5::VAddrUnImplMask);
73    }
74
75    static void checkCacheability(MemReqPtr &req);
76
77    // Checkpointing
78    virtual void serialize(std::ostream &os);
79    virtual void unserialize(Checkpoint *cp, const std::string &section);
80};
81
82class AlphaITB : public AlphaTLB
83{
84  protected:
85    mutable Stats::Scalar<> hits;
86    mutable Stats::Scalar<> misses;
87    mutable Stats::Scalar<> acv;
88    mutable Stats::Formula accesses;
89
90  protected:
91    void fault(Addr pc, ExecContext *xc) const;
92
93  public:
94    AlphaITB(const std::string &name, int size);
95    virtual void regStats();
96
97    Fault * translate(MemReqPtr &req) const;
98};
99
100class AlphaDTB : public AlphaTLB
101{
102  protected:
103    mutable Stats::Scalar<> read_hits;
104    mutable Stats::Scalar<> read_misses;
105    mutable Stats::Scalar<> read_acv;
106    mutable Stats::Scalar<> read_accesses;
107    mutable Stats::Scalar<> write_hits;
108    mutable Stats::Scalar<> write_misses;
109    mutable Stats::Scalar<> write_acv;
110    mutable Stats::Scalar<> write_accesses;
111    Stats::Formula hits;
112    Stats::Formula misses;
113    Stats::Formula acv;
114    Stats::Formula accesses;
115
116  protected:
117    void fault(MemReqPtr &req, uint64_t flags) const;
118
119  public:
120    AlphaDTB(const std::string &name, int size);
121    virtual void regStats();
122
123    Fault * translate(MemReqPtr &req, bool write) const;
124};
125
126#endif // __ALPHA_MEMORY_HH__
127