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/*
* Copyright (c) 2013 Andreas Sandberg
* 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: Andreas Sandberg
*/
#include "arch/generic/mmapped_ipr.hh"
#include "mem/packet.hh"
#include "mem/packet_access.hh"
#include "sim/pseudo_inst.hh"
using namespace GenericISA;
static void
handlePseudoInst(ThreadContext *xc, Packet *pkt)
{
const Addr offset(pkt->getAddr() & IPR_IN_CLASS_MASK);
const uint8_t func((offset >> 8) & 0xFF);
const uint8_t subfunc(offset & 0xFF);
uint64_t ret;
assert((offset >> 16) == 0);
ret = PseudoInst::pseudoInst(xc, func, subfunc);
if (pkt->isRead())
pkt->set(ret, TheISA::GuestByteOrder);
}
Cycles
GenericISA::handleGenericIprRead(ThreadContext *xc, Packet *pkt)
{
Addr va(pkt->getAddr());
Addr cls(va >> IPR_CLASS_SHIFT);
switch (cls) {
case IPR_CLASS_PSEUDO_INST:
handlePseudoInst(xc, pkt);
break;
default:
panic("Unhandled generic IPR read: 0x%x\n", va);
}
return Cycles(1);
}
Cycles
GenericISA::handleGenericIprWrite(ThreadContext *xc, Packet *pkt)
{
Addr va(pkt->getAddr());
Addr cls(va >> IPR_CLASS_SHIFT);
switch (cls) {
case IPR_CLASS_PSEUDO_INST:
handlePseudoInst(xc, pkt);
break;
default:
panic("Unhandled generic IPR write: 0x%x\n", va);
}
return Cycles(1);
}
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