src/arch/alpha/tlb.hh

   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/ev5.hh"
  35 #include "arch/alpha/isa_traits.hh"
  36 #include "arch/alpha/faults.hh"
  37 #include "base/statistics.hh"
  38 #include "mem/request.hh"
  39 #include "sim/sim_object.hh"
  40
  41 class ExecContext;
  42
  43 class AlphaTLB : public SimObject
  44 {
  45   protected:
  46     typedef std::multimap<Addr, int> PageTable;
  47     PageTable lookupTable;      // Quick lookup into page table
  48
  49     AlphaISA::PTE *table;       // the Page Table
  50     int size;                   // TLB Size
  51     int nlu;                    // not last used entry (for replacement)
  52
  53     void nextnlu() { if (++nlu >= size) nlu = 0; }
  54     AlphaISA::PTE *lookup(Addr vpn, uint8_t asn) const;
  55
  56   public:
  57     AlphaTLB(const std::string &name, int size);
  58     virtual ~AlphaTLB();
  59
  60     int getsize() const { return size; }
  61
  62     AlphaISA::PTE &index(bool advance = true);
  63     void insert(Addr vaddr, AlphaISA::PTE &pte);
  64
  65     void flushAll();
  66     void flushProcesses();
  67     void flushAddr(Addr addr, uint8_t asn);
  68
  69     // static helper functions... really EV5 VM traits
  70     static bool validVirtualAddress(Addr vaddr) {
  71         // unimplemented bits must be all 0 or all 1
  72         Addr unimplBits = vaddr & EV5::VAddrUnImplMask;
  73         return (unimplBits == 0) || (unimplBits == EV5::VAddrUnImplMask);
  74     }
  75
  76     static Fault checkCacheability(RequestPtr &req);
  77
  78     // Checkpointing
  79     virtual void serialize(std::ostream &os);
  80     virtual void unserialize(Checkpoint *cp, const std::string &section);
  81 };
  82
  83 class AlphaITB : public AlphaTLB
  84 {
  85   protected:
  86     mutable Stats::Scalar<> hits;
  87     mutable Stats::Scalar<> misses;
  88     mutable Stats::Scalar<> acv;
  89     mutable Stats::Formula accesses;
  90
  91   public:
  92     AlphaITB(const std::string &name, int size);
  93     virtual void regStats();
  94
  95     Fault translate(RequestPtr &req, ExecContext *xc) const;
  96 };
  97
  98 class AlphaDTB : public AlphaTLB
  99 {
 100   protected:
 101     mutable Stats::Scalar<> read_hits;
 102     mutable Stats::Scalar<> read_misses;
 103     mutable Stats::Scalar<> read_acv;
 104     mutable Stats::Scalar<> read_accesses;
 105     mutable Stats::Scalar<> write_hits;
 106     mutable Stats::Scalar<> write_misses;
 107     mutable Stats::Scalar<> write_acv;
 108     mutable Stats::Scalar<> write_accesses;
 109     Stats::Formula hits;
 110     Stats::Formula misses;
 111     Stats::Formula acv;
 112     Stats::Formula accesses;
 113
 114   public:
 115     AlphaDTB(const std::string &name, int size);
 116     virtual void regStats();
 117
 118     Fault translate(RequestPtr &req, ExecContext *xc, bool write) const;
 119 };
 120
 121 #endif // __ALPHA_MEMORY_HH__