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/*
* Copyright (c) 2007 MIPS Technologies, Inc.
* 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: Korey Sewell
*/
#ifndef __ARCH_MIPS_MT_HH__
#define __ARCH_MIPS_MT_HH__
/**
* @file
*
* ISA-specific helper functions for multithreaded execution.
*/
#include <iostream>
#include "arch/mips/faults.hh"
#include "arch/mips/isa_traits.hh"
#include "arch/mips/mt_constants.hh"
#include "arch/mips/pra_constants.hh"
#include "arch/mips/registers.hh"
#include "base/bitfield.hh"
#include "base/misc.hh"
#include "base/trace.hh"
namespace MipsISA
{
template <class TC>
inline unsigned
getVirtProcNum(TC *tc)
{
TCBindReg tcbind = tc->readMiscRegNoEffect(MISCREG_TC_BIND);
return tcbind.curVPE;
}
template <class TC>
inline unsigned
getTargetThread(TC *tc)
{
VPEControlReg vpeCtrl = tc->readMiscRegNoEffect(MISCREG_VPE_CONTROL);
return vpeCtrl.targTC;
}
template <class TC>
inline void
haltThread(TC *tc)
{
if (tc->status() == TC::Active) {
tc->halt();
// Save last known PC in TCRestart
// @TODO: Needs to check if this is a branch and if so,
// take previous instruction
PCState pc = tc->pcState();
tc->setMiscReg(MISCREG_TC_RESTART, pc.npc());
warn("%i: Halting thread %i in %s @ PC %x, setting restart PC to %x",
curTick(), tc->threadId(), tc->getCpuPtr()->name(),
pc.pc(), pc.npc());
}
}
template <class TC>
inline void
restoreThread(TC *tc)
{
if (tc->status() != TC::Active) {
// Restore PC from TCRestart
Addr restartPC = tc->readMiscRegNoEffect(MISCREG_TC_RESTART);
// TODO: SET PC WITH AN EVENT INSTEAD OF INSTANTANEOUSLY
tc->pcState(restartPC);
tc->activate();
warn("%i: Restoring thread %i in %s @ PC %x",
curTick(), tc->threadId(), tc->getCpuPtr()->name(), restartPC);
}
}
template <class TC>
void
forkThread(TC *tc, Fault &fault, int Rd_bits, int Rs, int Rt)
{
MVPConf0Reg mvpConf = tc->readMiscRegNoEffect(MISCREG_MVP_CONF0);
int num_threads = mvpConf.ptc + 1;
int success = 0;
for (ThreadID tid = 0; tid < num_threads && success == 0; tid++) {
TCBindReg tidTCBind =
tc->readRegOtherThread(RegId(MiscRegClass, MISCREG_TC_BIND), tid);
TCBindReg tcBind = tc->readMiscRegNoEffect(MISCREG_TC_BIND);
if (tidTCBind.curVPE == tcBind.curVPE) {
TCStatusReg tidTCStatus =
tc->readRegOtherThread(RegId(MiscRegClass, MISCREG_TC_STATUS),
tid);
TCHaltReg tidTCHalt =
tc->readRegOtherThread(RegId(MiscRegClass, MISCREG_TC_HALT),
tid);
if (tidTCStatus.da == 1 && tidTCHalt.h == 0 &&
tidTCStatus.a == 0 && success == 0) {
tc->setRegOtherThread(RegId(MiscRegClass, MISCREG_TC_RESTART),
Rs, tid);
tc->setRegOtherThread(RegId(IntRegClass, Rd_bits), Rt, tid);
StatusReg status = tc->readMiscReg(MISCREG_STATUS);
TCStatusReg tcStatus = tc->readMiscReg(MISCREG_TC_STATUS);
// Set Run-State to Running
tidTCStatus.rnst = 0;
// Set Delay-Slot to 0
tidTCStatus.tds = 0;
// Set Dirty TC to 1
tidTCStatus.dt = 1;
// Set Activated to 1
tidTCStatus.a = 1;
// Set status to previous thread's status
tidTCStatus.tksu = status.ksu;
// Set ASID to previous thread's state
tidTCStatus.asid = tcStatus.asid;
// Write Status Register
tc->setRegOtherThread(RegId(MiscRegClass, MISCREG_TC_STATUS),
tidTCStatus, tid);
// Mark As Successful Fork
success = 1;
}
} else {
std::cerr << "Bad VPEs" << std::endl;
}
}
if (success == 0) {
VPEControlReg vpeControl =
tc->readMiscRegNoEffect(MISCREG_VPE_CONTROL);
vpeControl.excpt = 1;
tc->setMiscReg(MISCREG_VPE_CONTROL, vpeControl);
fault = std::make_shared<ThreadFault>();
}
}
template <class TC>
int
yieldThread(TC *tc, Fault &fault, int src_reg, uint32_t yield_mask)
{
if (src_reg == 0) {
MVPConf0Reg mvpConf0 = tc->readMiscRegNoEffect(MISCREG_MVP_CONF0);
ThreadID num_threads = mvpConf0.ptc + 1;
int ok = 0;
// Get Current VPE & TC numbers from calling thread
TCBindReg tcBind = tc->readMiscRegNoEffect(MISCREG_TC_BIND);
for (ThreadID tid = 0; tid < num_threads; tid++) {
TCStatusReg tidTCStatus =
tc->readRegOtherThread(RegId(MiscRegClass, MISCREG_TC_STATUS),
tid);
TCHaltReg tidTCHalt =
tc->readRegOtherThread(RegId(MiscRegClass, MISCREG_TC_HALT),
tid);
TCBindReg tidTCBind =
tc->readRegOtherThread(RegId(MiscRegClass, MISCREG_TC_BIND),
tid);
if (tidTCBind.curVPE == tcBind.curVPE &&
tidTCBind.curTC == tcBind.curTC &&
tidTCStatus.da == 1 &&
tidTCHalt.h == 0 &&
tidTCStatus.a == 1) {
ok = 1;
}
}
if (ok == 1) {
TCStatusReg tcStatus = tc->readMiscRegNoEffect(MISCREG_TC_STATUS);
tcStatus.a = 0;
tc->setMiscReg(MISCREG_TC_STATUS, tcStatus);
warn("%i: Deactivating Hardware Thread Context #%i",
curTick(), tc->threadId());
}
} else if (src_reg > 0) {
if (src_reg && !yield_mask != 0) {
VPEControlReg vpeControl = tc->readMiscReg(MISCREG_VPE_CONTROL);
vpeControl.excpt = 2;
tc->setMiscReg(MISCREG_VPE_CONTROL, vpeControl);
fault = std::make_shared<ThreadFault>();
} else {
}
} else if (src_reg != -2) {
TCStatusReg tcStatus = tc->readMiscRegNoEffect(MISCREG_TC_STATUS);
VPEControlReg vpeControl =
tc->readMiscRegNoEffect(MISCREG_VPE_CONTROL);
if (vpeControl.ysi == 1 && tcStatus.dt == 1 ) {
vpeControl.excpt = 4;
fault = std::make_shared<ThreadFault>();
} else {
}
}
return src_reg & yield_mask;
}
// TC will usually be a object derived from ThreadContext
// (src/cpu/thread_context.hh)
template <class TC>
inline void
updateStatusView(TC *tc)
{
// TCStatus' register view must be the same as
// Status register view for CU, MX, KSU bits
TCStatusReg tcStatus = tc->readMiscRegNoEffect(MISCREG_TC_STATUS);
StatusReg status = tc->readMiscRegNoEffect(MISCREG_STATUS);
status.cu = tcStatus.tcu;
status.mx = tcStatus.tmx;
status.ksu = tcStatus.tksu;
tc->setMiscRegNoEffect(MISCREG_STATUS, status);
}
// TC will usually be a object derived from ThreadContext
// (src/cpu/thread_context.hh)
template <class TC>
inline void
updateTCStatusView(TC *tc)
{
// TCStatus' register view must be the same as
// Status register view for CU, MX, KSU bits
TCStatusReg tcStatus = tc->readMiscRegNoEffect(MISCREG_TC_STATUS);
StatusReg status = tc->readMiscRegNoEffect(MISCREG_STATUS);
tcStatus.tcu = status.cu;
tcStatus.tmx = status.mx;
tcStatus.tksu = status.ksu;
tc->setMiscRegNoEffect(MISCREG_TC_STATUS, tcStatus);
}
} // namespace MipsISA
#endif