gem5/src/arch/mips/mt.hh

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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 "arch/mips/faults.hh"
#include "arch/mips/isa_traits.hh"
#include "arch/mips/mt_constants.hh"
#include "arch/mips/registers.hh"
#include "base/bitfield.hh"
#include "base/trace.hh"
#include "base/misc.hh"
#include <iostream>
namespace MipsISA
{
template <class TC>
inline unsigned
getVirtProcNum(TC *tc)
{
MiscReg tcbind = tc->readMiscRegNoEffect(TCBind);
return bits(tcbind, TCB_CUR_VPE_HI, TCB_CUR_VPE_LO);
}
template <class TC>
inline unsigned
getTargetThread(TC *tc)
{
MiscReg vpec_ctrl = tc->readMiscRegNoEffect(VPEControl);
return bits(vpec_ctrl, VPEC_TARG_TC_HI, VPEC_TARG_TC_LO);
}
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
tc->setMiscReg(TCRestart, tc->readNextPC());
warn("%i: Halting thread %i in %s @ PC %x, setting restart PC to %x", curTick, tc->threadId(), tc->getCpuPtr()->name(),
tc->readPC(), tc->readNextPC());
}
}
template <class TC>
inline void
restoreThread(TC *tc)
{
if (tc->status() != TC::Active) {
// Restore PC from TCRestart
IntReg pc = tc->readMiscRegNoEffect(TCRestart);
// TODO: SET PC WITH AN EVENT INSTEAD OF INSTANTANEOUSLY
// tc->setPCEvent(pc, pc + 4, pc + 8);
tc->setPC(pc);
tc->setNextPC(pc + 4);
tc->setNextNPC(pc + 8);
tc->activate(0);
warn("%i: Restoring thread %i in %s @ PC %x", curTick, tc->threadId(), tc->getCpuPtr()->name(),
tc->readPC());
}
}
template <class TC>
void
forkThread(TC *tc, Fault &fault, int Rd_bits, int Rs, int Rt)
{
int num_threads = bits(tc->readMiscRegNoEffect(MVPConf0), MVPC0_PTC_HI, MVPC0_PTC_LO) + 1;
int success = 0;
for (ThreadID tid = 0; tid < num_threads && success == 0; tid++) {
unsigned tid_TCBind = tc->readRegOtherThread(MipsISA::TCBind + Ctrl_Base_DepTag,
tid);
unsigned tc_bind = tc->readMiscRegNoEffect(MipsISA::TCBind);
if (bits(tid_TCBind, TCB_CUR_VPE_HI, TCB_CUR_VPE_LO) ==
bits(tc_bind, TCB_CUR_VPE_HI, TCB_CUR_VPE_LO)) {
unsigned tid_TCStatus = tc->readRegOtherThread(MipsISA::TCStatus + Ctrl_Base_DepTag,
tid);
unsigned tid_TCHalt = tc->readRegOtherThread(MipsISA::TCHalt + Ctrl_Base_DepTag,
tid);
if (bits(tid_TCStatus, TCS_DA) == 1 &&
bits(tid_TCHalt, TCH_H) == 0 &&
bits(tid_TCStatus, TCS_A) == 0 &&
success == 0) {
tc->setRegOtherThread(MipsISA::TCRestart + Ctrl_Base_DepTag, Rs, tid);
tc->setRegOtherThread(Rd_bits, Rt, tid);
unsigned status_ksu = bits(tc->readMiscReg(MipsISA::Status),
S_KSU_HI, S_KSU_LO);
unsigned tc_status_asid = bits(tc->readMiscReg(MipsISA::TCStatus),
TCS_ASID_HI, TCS_ASID_LO);
// Set Run-State to Running
replaceBits(tid_TCStatus, TCSTATUS_RNST_HI, TCSTATUS_RNST_LO, 0);
// Set Delay-Slot to 0
replaceBits(tid_TCStatus, TCSTATUS_TDS, 0);
// Set Dirty TC to 1
replaceBits(tid_TCStatus, TCSTATUS_DT, 1);
// Set Activated to 1
replaceBits(tid_TCStatus, TCSTATUS_A, 1);
// Set status to previous thread's status
replaceBits(tid_TCStatus, TCSTATUS_TKSU_HI, TCSTATUS_TKSU_LO, status_ksu);
// Set ASID to previous thread's state
replaceBits(tid_TCStatus, TCSTATUS_ASID_HI, TCSTATUS_ASID_LO, tc_status_asid);
// Write Status Register
tc->setRegOtherThread(MipsISA::TCStatus + Ctrl_Base_DepTag,
tid_TCStatus, tid);
// Mark As Successful Fork
success = 1;
}
} else {
std::cerr << "Bad VPEs" << std::endl;
}
}
if (success == 0) {
unsigned vpe_control = tc->readMiscRegNoEffect(MipsISA::VPEControl);
tc->setMiscReg(VPEControl, insertBits(vpe_control, VPEC_EXCPT_HI, VPEC_EXCPT_LO, 1));
fault = new ThreadFault();
}
}
template <class TC>
int
yieldThread(TC *tc, Fault &fault, int src_reg, uint32_t yield_mask)
{
if (src_reg == 0) {
unsigned mvpconf0 = tc->readMiscRegNoEffect(MVPConf0);
ThreadID num_threads = bits(mvpconf0, MVPC0_PTC_HI, MVPC0_PTC_LO) + 1;
int ok = 0;
// Get Current VPE & TC numbers from calling thread
unsigned tcbind = tc->readMiscRegNoEffect(TCBind);
unsigned cur_vpe = bits(tcbind, TCB_CUR_VPE_HI, TCB_CUR_VPE_LO);
unsigned cur_tc = bits(tcbind, TCB_CUR_TC_HI, TCB_CUR_TC_LO);
for (ThreadID tid = 0; tid < num_threads; tid++) {
unsigned tid_TCStatus = tc->readRegOtherThread(MipsISA::TCStatus + Ctrl_Base_DepTag,
tid);
unsigned tid_TCHalt = tc->readRegOtherThread(MipsISA::TCHalt + Ctrl_Base_DepTag,
tid);
unsigned tid_TCBind = tc->readRegOtherThread(MipsISA::TCBind + Ctrl_Base_DepTag,
tid);
unsigned tid_vpe = bits(tid_TCBind, TCB_CUR_VPE_HI, TCB_CUR_VPE_LO);
unsigned tid_tc = bits(tid_TCBind, TCB_CUR_TC_HI, TCB_CUR_TC_LO);
unsigned tid_tcstatus_da = bits(tid_TCStatus, TCS_DA);
unsigned tid_tcstatus_a = bits(tid_TCStatus, TCS_A);
unsigned tid_tchalt_h = bits(tid_TCHalt, TCH_H);
if (tid_vpe == cur_vpe &&
tid_tc == cur_tc &&
tid_tcstatus_da == 1 &&
tid_tchalt_h == 0 &&
tid_tcstatus_a == 1) {
ok = 1;
}
}
if (ok == 1) {
unsigned tcstatus = tc->readMiscRegNoEffect(TCStatus);
tc->setMiscReg(TCStatus, insertBits(tcstatus, TCS_A, TCS_A, 0));
warn("%i: Deactivating Hardware Thread Context #%i", curTick, tc->threadId());
}
} else if (src_reg > 0) {
if (src_reg && !yield_mask != 0) {
unsigned vpe_control = tc->readMiscReg(VPEControl);
tc->setMiscReg(VPEControl, insertBits(vpe_control, VPEC_EXCPT_HI, VPEC_EXCPT_LO, 2));
fault = new ThreadFault();
} else {
//tc->setThreadRescheduleCondition(src_reg & yield_mask);
}
} else if (src_reg != -2) {
unsigned tcstatus = tc->readMiscRegNoEffect(TCStatus);
unsigned vpe_control = tc->readMiscRegNoEffect(VPEControl);
unsigned tcstatus_dt = bits(tcstatus, TCS_DT);
unsigned vpe_control_ysi = bits(vpe_control, VPEC_YSI);
if (vpe_control_ysi == 1 && tcstatus_dt == 1 ) {
tc->setMiscReg(VPEControl, insertBits(vpe_control, VPEC_EXCPT_HI, VPEC_EXCPT_LO, 4));
fault = new ThreadFault();
} else {
//tc->ScheduleOtherThreads();
//std::cerr << "T" << tc->threadId() << "YIELD: Schedule Other Threads.\n" << std::endl;
//tc->suspend();
// Save last known PC in TCRestart
// @TODO: Needs to check if this is a branch and if so, take previous instruction
//tc->setMiscRegWithEffect(TCRestart, tc->readNextPC());
}
}
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
MiscReg tc_status = tc->readMiscRegNoEffect(TCStatus);
MiscReg status = tc->readMiscRegNoEffect(Status);
unsigned cu_bits = bits(tc_status, TCS_TCU_HI, TCS_TCU_LO);
replaceBits(status, S_CU_HI, S_CU_LO, cu_bits);
unsigned mx_bits = bits(tc_status, TCS_TMX);
replaceBits(status, S_MX, S_MX, mx_bits);
unsigned ksu_bits = bits(tc_status, TCS_TKSU_HI, TCS_TKSU_LO);
replaceBits(status, S_KSU_HI, S_KSU_LO, ksu_bits);
tc->setMiscRegNoEffect(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
MiscReg tc_status = tc->readMiscRegNoEffect(TCStatus);
MiscReg status = tc->readMiscRegNoEffect(Status);
unsigned cu_bits = bits(status, S_CU_HI, S_CU_LO);
replaceBits(tc_status, TCS_TCU_HI, TCS_TCU_LO, cu_bits);
unsigned mx_bits = bits(status, S_MX, S_MX);
replaceBits(tc_status, TCS_TMX, mx_bits);
unsigned ksu_bits = bits(status, S_KSU_HI, S_KSU_LO);
replaceBits(tc_status, TCS_TKSU_HI, TCS_TKSU_LO, ksu_bits);
tc->setMiscRegNoEffect(TCStatus, tc_status);
}
} // namespace MipsISA
#endif