gem5/src/mem/translating_port_proxy.cc

/*
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 * Copyright (c) 2006 The Regents of The University of Michigan
 * All rights reserved.
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 * met: redistributions of source code must retain the above copyright
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/**
 * @file
 * Port object definitions.
 */

#include "mem/translating_port_proxy.hh"

#include "base/chunk_generator.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
#include "sim/system.hh"

TranslatingPortProxy::TranslatingPortProxy(
        ThreadContext *tc, Request::Flags _flags) :
    PortProxy(tc->getCpuPtr()->getSendFunctional(),
              tc->getSystemPtr()->cacheLineSize()), _tc(tc),
              pageBytes(tc->getSystemPtr()->getPageBytes()),
              flags(_flags)
{}

bool
TranslatingPortProxy::tryTLBsOnce(RequestPtr req, BaseTLB::Mode mode) const
{
    BaseTLB *dtb = _tc->getDTBPtr();
    BaseTLB *itb = _tc->getDTBPtr();
    return dtb->translateFunctional(req, _tc, mode) == NoFault ||
           itb->translateFunctional(req, _tc, BaseTLB::Read) == NoFault;
}

bool
TranslatingPortProxy::tryTLBs(RequestPtr req, BaseTLB::Mode mode) const
{
    // If at first this doesn't succeed, try to fixup and translate again. If
    // it still fails, report failure.
    return tryTLBsOnce(req, mode) ||
        (fixupAddr(req->getVaddr(), mode) && tryTLBsOnce(req, mode));
}

bool
TranslatingPortProxy::tryReadBlob(Addr addr, void *p, int size) const
{
    for (ChunkGenerator gen(addr, size, pageBytes); !gen.done();
         gen.next())
    {
        auto req = std::make_shared<Request>(
                gen.addr(), gen.size(), flags, Request::funcRequestorId, 0,
                _tc->contextId());

        if (!tryTLBs(req, BaseTLB::Read))
            return false;

        PortProxy::readBlobPhys(
                req->getPaddr(), req->getFlags(), p, gen.size());

        p = static_cast<uint8_t *>(p) + gen.size();
    }
    return true;
}

bool
TranslatingPortProxy::tryWriteBlob(
        Addr addr, const void *p, int size) const
{
    for (ChunkGenerator gen(addr, size, pageBytes); !gen.done();
         gen.next())
    {
        auto req = std::make_shared<Request>(
                gen.addr(), gen.size(), flags, Request::funcRequestorId, 0,
                _tc->contextId());

        if (!tryTLBs(req, BaseTLB::Write))
            return false;

        PortProxy::writeBlobPhys(
                req->getPaddr(), req->getFlags(), p, gen.size());
        p = static_cast<const uint8_t *>(p) + gen.size();
    }
    return true;
}

bool
TranslatingPortProxy::tryMemsetBlob(Addr address, uint8_t v, int size) const
{
    for (ChunkGenerator gen(address, size, pageBytes); !gen.done();
         gen.next())
    {
        auto req = std::make_shared<Request>(
                gen.addr(), gen.size(), flags, Request::funcRequestorId, 0,
                _tc->contextId());

        if (!tryTLBs(req, BaseTLB::Write))
            return false;

        PortProxy::memsetBlobPhys(
                req->getPaddr(), req->getFlags(), v, gen.size());
    }
    return true;
}