gem5  v20.1.0.0
tlb.hh
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1 /*
2  * Copyright (c) 2001-2005 The Regents of The University of Michigan
3  * Copyright (c) 2007 MIPS Technologies, Inc.
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29 
30 #ifndef __ARCH_MIPS_TLB_HH__
31 #define __ARCH_MIPS_TLB_HH__
32 
33 #include <map>
34 
35 #include "arch/generic/tlb.hh"
36 #include "arch/mips/isa_traits.hh"
37 #include "arch/mips/pagetable.hh"
38 #include "arch/mips/utility.hh"
39 #include "base/statistics.hh"
40 #include "mem/request.hh"
41 #include "params/MipsTLB.hh"
42 #include "sim/sim_object.hh"
43 
44 class ThreadContext;
45 
46 /* MIPS does not distinguish between a DTLB and an ITLB -> unified TLB
47  However, to maintain compatibility with other architectures, we'll
48  simply create an ITLB and DTLB that will point to the real TLB */
49 namespace MipsISA {
50 
51 class TLB : public BaseTLB
52 {
53  protected:
54  typedef std::multimap<Addr, int> PageTable;
55  PageTable lookupTable; // Quick lookup into page table
56 
57  MipsISA::PTE *table; // the Page Table
58  int size; // TLB Size
59  int nlu; // not last used entry (for replacement)
60 
61  void nextnlu() { if (++nlu >= size) nlu = 0; }
62  MipsISA::PTE *lookup(Addr vpn, uint8_t asn) const;
63 
64  public:
65  typedef MipsTLBParams Params;
66  TLB(const Params *p);
67 
68  int probeEntry(Addr vpn,uint8_t) const;
69  MipsISA::PTE *getEntry(unsigned) const;
70  virtual ~TLB();
71 
72  void takeOverFrom(BaseTLB *otlb) override {}
73 
75  int getsize() const { return size; }
76 
77  MipsISA::PTE &index(bool advance = true);
78  void insert(Addr vaddr, MipsISA::PTE &pte);
79  void insertAt(MipsISA::PTE &pte, unsigned Index, int _smallPages);
80  void flushAll() override;
81  void demapPage(Addr vaddr, uint64_t asn) override
82  {
83  panic("demapPage unimplemented.\n");
84  }
85 
86  // static helper functions... really
87  static bool validVirtualAddress(Addr vaddr);
88 
89  static Fault checkCacheability(const RequestPtr &req);
90 
91  // Checkpointing
92  void serialize(CheckpointOut &cp) const override;
93  void unserialize(CheckpointIn &cp) override;
94 
96  const RequestPtr &req, ThreadContext *tc, Mode mode) override;
97  void translateTiming(
98  const RequestPtr &req, ThreadContext *tc,
99  Translation *translation, Mode mode) override;
101  const RequestPtr &req, ThreadContext *tc, Mode mode) override;
103  const RequestPtr &req,
104  ThreadContext *tc, Mode mode) const override;
105 };
106 
107 }
108 
109 
110 
111 #endif // __MIPS_MEMORY_HH__
MipsISA::TLB::takeOverFrom
void takeOverFrom(BaseTLB *otlb) override
Take over from an old tlb context.
Definition: tlb.hh:72
MipsISA::TLB::size
int size
Definition: tlb.hh:58
MipsISA::TLB::translateFunctional
Fault translateFunctional(const RequestPtr &req, ThreadContext *tc, Mode mode) override
Definition: tlb.cc:236
MipsISA::TLB::table
MipsISA::PTE * table
Definition: tlb.hh:57
MipsISA::TLB::index
MipsISA::PTE & index(bool advance=true)
Definition: tlb.cc:251
MipsISA::TLB::lookup
MipsISA::PTE * lookup(Addr vpn, uint8_t asn) const
Definition: tlb.cc:72
MipsISA::TLB::serialize
void serialize(CheckpointOut &cp) const override
Serialize an object.
Definition: tlb.cc:194
MipsISA::TLB::translateTiming
void translateTiming(const RequestPtr &req, ThreadContext *tc, Translation *translation, Mode mode) override
Definition: tlb.cc:228
tlb.hh
MipsISA::TLB::flushAll
void flushAll() override
Remove all entries from the TLB.
Definition: tlb.cc:185
BaseTLB::Mode
Mode
Definition: tlb.hh:57
MipsISA::TLB::getsize
int getsize() const
Definition: tlb.hh:75
MipsISA::TLB::TLB
TLB(const Params *p)
Definition: tlb.cc:57
RequestPtr
std::shared_ptr< Request > RequestPtr
Definition: request.hh:82
MipsISA::TLB::translateAtomic
Fault translateAtomic(const RequestPtr &req, ThreadContext *tc, Mode mode) override
Definition: tlb.cc:221
MipsISA::TLB::getEntry
MipsISA::PTE * getEntry(unsigned) const
Definition: tlb.cc:102
MipsISA::PTE
Definition: pagetable.hh:40
MipsISA::TLB::PageTable
std::multimap< Addr, int > PageTable
Definition: tlb.hh:54
request.hh
BaseTLB
Definition: tlb.hh:50
MipsISA
Definition: decoder.cc:31
MipsISA::TLB
Definition: tlb.hh:51
cp
Definition: cprintf.cc:40
ThreadContext
ThreadContext is the external interface to all thread state for anything outside of the CPU.
Definition: thread_context.hh:88
MipsISA::TLB::nextnlu
void nextnlu()
Definition: tlb.hh:61
sim_object.hh
MipsISA::TLB::nlu
int nlu
Definition: tlb.hh:59
Fault
std::shared_ptr< FaultBase > Fault
Definition: types.hh:240
MipsISA::vaddr
vaddr
Definition: pra_constants.hh:275
statistics.hh
MipsISA::TLB::demapPage
void demapPage(Addr vaddr, uint64_t asn) override
Definition: tlb.hh:81
utility.hh
MipsISA::TLB::~TLB
virtual ~TLB()
Definition: tlb.cc:65
Addr
uint64_t Addr
Address type This will probably be moved somewhere else in the near future.
Definition: types.hh:142
MipsISA::TLB::validVirtualAddress
static bool validVirtualAddress(Addr vaddr)
MipsISA::TLB::unserialize
void unserialize(CheckpointIn &cp) override
Unserialize an object.
Definition: tlb.cc:206
MipsISA::mode
Bitfield< 11, 7 > mode
Definition: dt_constants.hh:95
MipsISA::TLB::Params
MipsTLBParams Params
Definition: tlb.hh:65
MipsISA::TLB::checkCacheability
static Fault checkCacheability(const RequestPtr &req)
Definition: tlb.cc:138
MipsISA::TLB::lookupTable
PageTable lookupTable
Definition: tlb.hh:55
isa_traits.hh
MipsISA::TLB::insertAt
void insertAt(MipsISA::PTE &pte, unsigned Index, int _smallPages)
Definition: tlb.cc:151
CheckpointOut
std::ostream CheckpointOut
Definition: serialize.hh:63
MipsISA::TLB::probeEntry
int probeEntry(Addr vpn, uint8_t) const
Definition: tlb.cc:110
MipsISA::TLB::insert
void insert(Addr vaddr, MipsISA::PTE &pte)
Definition: tlb.cc:179
MipsISA::p
Bitfield< 0 > p
Definition: pra_constants.hh:323
MipsISA::TLB::finalizePhysical
Fault finalizePhysical(const RequestPtr &req, ThreadContext *tc, Mode mode) const override
Do post-translation physical address finalization.
Definition: tlb.cc:243
CheckpointIn
Definition: serialize.hh:67
pagetable.hh
panic
#define panic(...)
This implements a cprintf based panic() function.
Definition: logging.hh:171
MipsISA::TLB::smallPages
int smallPages
Definition: tlb.hh:74

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