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/*
* Copyright (c) 2011 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) 2006 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: Gabe Black
*/
#ifndef __ARCH_GENERIC_TLB_HH__
#define __ARCH_GENERIC_TLB_HH__
#include "base/logging.hh"
#include "mem/request.hh"
#include "sim/sim_object.hh"
class ThreadContext;
class BaseTLB : public SimObject
{
protected:
BaseTLB(const Params *p) : SimObject(p) {}
public:
enum Mode { Read, Write, Execute };
class Translation
{
public:
virtual ~Translation()
{}
/**
* Signal that the translation has been delayed due to a hw page table
* walk.
*/
virtual void markDelayed() = 0;
/*
* The memory for this object may be dynamically allocated, and it may
* be responsible for cleaning itself up which will happen in this
* function. Once it's called, the object is no longer valid.
*/
virtual void finish(const Fault &fault, const RequestPtr &req,
ThreadContext *tc, Mode mode) = 0;
/** This function is used by the page table walker to determine if it
* should translate the a pending request or if the underlying request
* has been squashed.
* @ return Is the instruction that requested this translation squashed?
*/
virtual bool squashed() const { return false; }
};
public:
virtual void demapPage(Addr vaddr, uint64_t asn) = 0;
virtual Fault translateAtomic(
const RequestPtr &req, ThreadContext *tc, Mode mode) = 0;
virtual void translateTiming(
const RequestPtr &req, ThreadContext *tc,
Translation *translation, Mode mode) = 0;
virtual Fault
translateFunctional(const RequestPtr &req, ThreadContext *tc, Mode mode)
{
panic("Not implemented.\n");
}
/**
* Do post-translation physical address finalization.
*
* This method is used by some architectures that need
* post-translation massaging of physical addresses. For example,
* X86 uses this to remap physical addresses in the APIC range to
* a range of physical memory not normally available to real x86
* implementations.
*
* @param req Request to updated in-place.
* @param tc Thread context that created the request.
* @param mode Request type (read/write/execute).
* @return A fault on failure, NoFault otherwise.
*/
virtual Fault finalizePhysical(
const RequestPtr &req, ThreadContext *tc, Mode mode) const = 0;
/**
* Remove all entries from the TLB
*/
virtual void flushAll() = 0;
/**
* Take over from an old tlb context
*/
virtual void takeOverFrom(BaseTLB *otlb) = 0;
/**
* Get the table walker port if present. This is used for
* migrating port connections during a CPU takeOverFrom()
* call. For architectures that do not have a table walker, NULL
* is returned, hence the use of a pointer rather than a
* reference.
*
* @return A pointer to the walker port or NULL if not present
*/
virtual Port* getTableWalkerPort() { return NULL; }
void memInvalidate() { flushAll(); }
};
class GenericTLB : public BaseTLB
{
protected:
GenericTLB(const Params *p)
: BaseTLB(p)
{}
public:
void demapPage(Addr vaddr, uint64_t asn) override;
Fault translateAtomic(
const RequestPtr &req, ThreadContext *tc, Mode mode) override;
void translateTiming(
const RequestPtr &req, ThreadContext *tc,
Translation *translation, Mode mode) override;
Fault finalizePhysical(
const RequestPtr &req, ThreadContext *tc, Mode mode) const override;
};
#endif // __ARCH_GENERIC_TLB_HH__
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