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/*
* Copyright (c) 2012-2013, 2015 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.
*
* 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: Thomas Grocutt
*/
#include "arch/arm/stage2_mmu.hh"
#include "arch/arm/faults.hh"
#include "arch/arm/system.hh"
#include "arch/arm/table_walker.hh"
#include "arch/arm/tlb.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
using namespace ArmISA;
Stage2MMU::Stage2MMU(const Params *p)
: SimObject(p), _stage1Tlb(p->tlb), _stage2Tlb(p->stage2_tlb),
port(_stage1Tlb->getTableWalker(), p->sys),
masterId(p->sys->getMasterId(_stage1Tlb->getTableWalker()))
{
// we use the stage-one table walker as the parent of the port,
// and to get our master id, this is done to keep things
// symmetrical with other ISAs in terms of naming and stats
stage1Tlb()->setMMU(this, masterId);
stage2Tlb()->setMMU(this, masterId);
}
Fault
Stage2MMU::readDataUntimed(ThreadContext *tc, Addr oVAddr, Addr descAddr,
uint8_t *data, int numBytes, Request::Flags flags, bool isFunctional)
{
Fault fault;
// translate to physical address using the second stage MMU
auto req = std::make_shared<Request>();
req->setVirt(0, descAddr, numBytes, flags | Request::PT_WALK, masterId, 0);
if (isFunctional) {
fault = stage2Tlb()->translateFunctional(req, tc, BaseTLB::Read);
} else {
fault = stage2Tlb()->translateAtomic(req, tc, BaseTLB::Read);
}
// Now do the access.
if (fault == NoFault && !req->getFlags().isSet(Request::NO_ACCESS)) {
Packet pkt = Packet(req, MemCmd::ReadReq);
pkt.dataStatic(data);
if (isFunctional) {
port.sendFunctional(&pkt);
} else {
port.sendAtomic(&pkt);
}
assert(!pkt.isError());
}
// If there was a fault annotate it with the flag saying the foult occured
// while doing a translation for a stage 1 page table walk.
if (fault != NoFault) {
ArmFault *armFault = reinterpret_cast<ArmFault *>(fault.get());
armFault->annotate(ArmFault::S1PTW, true);
armFault->annotate(ArmFault::OVA, oVAddr);
}
return fault;
}
void
Stage2MMU::readDataTimed(ThreadContext *tc, Addr descAddr,
Stage2Translation *translation, int numBytes,
Request::Flags flags)
{
// translate to physical address using the second stage MMU
translation->setVirt(
descAddr, numBytes, flags | Request::PT_WALK, masterId);
translation->translateTiming(tc);
}
Stage2MMU::Stage2Translation::Stage2Translation(Stage2MMU &_parent,
uint8_t *_data, Event *_event, Addr _oVAddr)
: data(_data), numBytes(0), event(_event), parent(_parent), oVAddr(_oVAddr),
fault(NoFault)
{
req = std::make_shared<Request>();
}
void
Stage2MMU::Stage2Translation::finish(const Fault &_fault,
const RequestPtr &req,
ThreadContext *tc, BaseTLB::Mode mode)
{
fault = _fault;
// If there was a fault annotate it with the flag saying the foult occured
// while doing a translation for a stage 1 page table walk.
if (fault != NoFault) {
ArmFault *armFault = reinterpret_cast<ArmFault *>(fault.get());
armFault->annotate(ArmFault::S1PTW, true);
armFault->annotate(ArmFault::OVA, oVAddr);
}
if (_fault == NoFault && !req->getFlags().isSet(Request::NO_ACCESS)) {
parent.getPort().dmaAction(MemCmd::ReadReq, req->getPaddr(), numBytes,
event, data, tc->getCpuPtr()->clockPeriod(),
req->getFlags());
} else {
// We can't do the DMA access as there's been a problem, so tell the
// event we're done
event->process();
}
}
ArmISA::Stage2MMU *
ArmStage2MMUParams::create()
{
return new ArmISA::Stage2MMU(this);
}