port_proxy.cc

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#include "mem/port_proxy.hh"
 
#include "base/chunk_generator.hh"
#include "cpu/thread_context.hh"
#include "mem/port.hh"
 
namespace gem5
{
 
PortProxy::PortProxy(ThreadContext *tc, Addr cache_line_size) :
    PortProxy([tc](PacketPtr pkt)->void { tc->sendFunctional(pkt); },
        cache_line_size)
{}
 
PortProxy::PortProxy(const RequestPort &port, Addr cache_line_size) :
    PortProxy([&port](PacketPtr pkt)->void { port.sendFunctional(pkt); },
        cache_line_size)
{}
 
void
PortProxy::readBlobPhys(Addr addr, Request::Flags flags,
                        void *p, uint64_t size) const
{
    for (ChunkGenerator gen(addr, size, _cacheLineSize); !gen.done();
         gen.next()) {
 
        auto req = std::make_shared<Request>(
            gen.addr(), gen.size(), flags, Request::funcRequestorId);
 
        Packet pkt(req, MemCmd::ReadReq);
        pkt.dataStatic(static_cast<uint8_t *>(p));
        sendFunctional(&pkt);
        p = static_cast<uint8_t *>(p) + gen.size();
    }
}
 
void
PortProxy::writeBlobPhys(Addr addr, Request::Flags flags,
                         const void *p, uint64_t size) const
{
    for (ChunkGenerator gen(addr, size, _cacheLineSize); !gen.done();
         gen.next()) {
 
        auto req = std::make_shared<Request>(
            gen.addr(), gen.size(), flags, Request::funcRequestorId);
 
        Packet pkt(req, MemCmd::WriteReq);
        pkt.dataStaticConst(static_cast<const uint8_t *>(p));
        sendFunctional(&pkt);
        p = static_cast<const uint8_t *>(p) + gen.size();
    }
}
 
void
PortProxy::memsetBlobPhys(Addr addr, Request::Flags flags,
                          uint8_t v, uint64_t size) const
{
    // quick and dirty...
    uint8_t *buf = new uint8_t[size];
 
    std::memset(buf, v, size);
    PortProxy::writeBlobPhys(addr, flags, buf, size);
 
    delete [] buf;
}
 
bool
PortProxy::tryWriteString(Addr addr, const char *str) const
{
    do {
        if (!tryWriteBlob(addr++, str, 1))
            return false;
    } while (*str++);
    return true;
}
 
bool
PortProxy::tryReadString(std::string &str, Addr addr) const
{
    while (true) {
        uint8_t c;
        if (!tryReadBlob(addr++, &c, 1))
            return false;
        if (!c)
            return true;
        str += c;
    }
}
 
bool
PortProxy::tryReadString(char *str, Addr addr, size_t maxlen) const
{
    assert(maxlen);
    while (maxlen--) {
        if (!tryReadBlob(addr++, str, 1))
            return false;
        if (!*str++)
            return true;
    }
    // We ran out of room, so back up and add a terminator.
    *--str = '\0';
    return true;
}
 
} // namespace gem5