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/*
* Copyright (c) 2010 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2001-2005 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Ali Saidi
*/
#ifndef __ARCH_ARM_TLB_HH__
#define __ARCH_ARM_TLB_HH__
#include <map>
#include "arch/arm/isa_traits.hh"
#include "arch/arm/utility.hh"
#include "arch/arm/vtophys.hh"
#include "arch/arm/pagetable.hh"
#include "base/statistics.hh"
#include "mem/request.hh"
#include "params/ArmTLB.hh"
#include "sim/faults.hh"
#include "sim/tlb.hh"
class ThreadContext;
namespace ArmISA {
class TLB : public BaseTLB
{
public:
enum ArmFlags {
AlignmentMask = 0x7,
AlignByte = 0x0,
AlignHalfWord = 0x1,
AlignWord = 0x3,
AlignDoubleWord = 0x7,
AllowUnaligned = 0x8,
// Because zero otherwise looks like a valid setting and may be used
// accidentally, this bit must be non-zero to show it was used on
// purpose.
MustBeOne = 0x10
};
protected:
typedef std::multimap<Addr, int> PageTable;
PageTable lookupTable; // Quick lookup into page table
ArmISA::PTE *table; // the Page Table
int size; // TLB Size
int nlu; // not last used entry (for replacement)
void nextnlu() { if (++nlu >= size) nlu = 0; }
ArmISA::PTE *lookup(Addr vpn, uint8_t asn) const;
// Access Stats
mutable Stats::Scalar read_hits;
mutable Stats::Scalar read_misses;
mutable Stats::Scalar read_acv;
mutable Stats::Scalar read_accesses;
mutable Stats::Scalar write_hits;
mutable Stats::Scalar write_misses;
mutable Stats::Scalar write_acv;
mutable Stats::Scalar write_accesses;
Stats::Formula hits;
Stats::Formula misses;
Stats::Formula invalids;
Stats::Formula accesses;
public:
typedef ArmTLBParams Params;
TLB(const Params *p);
virtual ~TLB();
int getsize() const { return size; }
void insert(Addr vaddr, ArmISA::PTE &pte);
void flushAll();
void demapPage(Addr vaddr, uint64_t asn)
{
panic("demapPage unimplemented.\n");
}
static bool validVirtualAddress(Addr vaddr);
Fault translateAtomic(RequestPtr req, ThreadContext *tc, Mode mode);
void translateTiming(RequestPtr req, ThreadContext *tc,
Translation *translation, Mode mode);
// Checkpointing
void serialize(std::ostream &os);
void unserialize(Checkpoint *cp, const std::string §ion);
void regStats();
};
/* namespace ArmISA */ }
#endif // __ARCH_ARM_TLB_HH__
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