gem5/cpu/o3/alpha_cpu_impl.hh
Gabe Black 8e4ec55703 Changed the floating point register file into a class with appropriate accessor functions. The width of the floating point register to access can be specified, and if not, it will be accessed at its "natural" width. That is, the width of each individual register. Also, the functions which access the bit representation of floating point registers can use the blahblahBits functions now instead of blahblahInt.
arch/alpha/arguments.cc:
    Renamed readFloatRegInt to readFloatRegBits
arch/alpha/ev5.cc:
    Removed the Double from setFloatRegDouble
arch/alpha/registerfile.hh:
    Changed the floating point register file from a union of arrays to a class with appropriate accessor functions. The interface is necessary for SPARC.
arch/alpha/types.hh:
    Changed the FloatReg type from a union of uint64_t and double to a double, and defined a new type FloatRegBits which is a uint64_t and is used to return the bits which compose a floating point register rather than the value of the register.
arch/isa_parser.py:
    Adjusted the makeRead and makeWrite functions to generate the new versions of readFloatReg and setFloatReg.
base/remote_gdb.cc:
kern/tru64/tru64.hh:
    Replaced setFloatRegInt with setFloatRegBits
cpu/cpu_exec_context.cc:
    Removed the duplicated code for setting the floating point registers, and renamed the function to setFloatRegBits and readFloatRegBits.
cpu/cpu_exec_context.hh:
cpu/exec_context.hh:
cpu/o3/alpha_cpu_impl.hh:
cpu/o3/alpha_dyn_inst.hh:
cpu/o3/cpu.cc:
cpu/o3/cpu.hh:
cpu/o3/regfile.hh:
cpu/ozone/cpu.hh:
cpu/simple/cpu.hh:
    Implemented the new versions of the floating point read and set functions.
cpu/simple/cpu.cc:
    Replaced setFloatRegDouble with setFloatReg

--HG--
extra : convert_revision : 3dad06224723137f6033c335fb8f6395636767f2
2006-03-14 15:55:00 -05:00

371 lines
11 KiB
C++

/*
* Copyright (c) 2004-2005 The Regents of The University of Michigan
* 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.
*/
#include "arch/alpha/faults.hh"
#include "base/cprintf.hh"
#include "base/statistics.hh"
#include "base/timebuf.hh"
#include "mem/cache/cache.hh" // for dynamic cast
#include "mem/mem_interface.hh"
#include "sim/builder.hh"
#include "sim/sim_events.hh"
#include "sim/stats.hh"
#include "cpu/o3/alpha_cpu.hh"
#include "cpu/o3/alpha_params.hh"
#include "cpu/o3/comm.hh"
#if FULL_SYSTEM
#include "arch/alpha/osfpal.hh"
#include "arch/alpha/isa_traits.hh"
#endif
template <class Impl>
AlphaFullCPU<Impl>::AlphaFullCPU(Params &params)
: FullO3CPU<Impl>(params)
{
DPRINTF(FullCPU, "AlphaFullCPU: Creating AlphaFullCPU object.\n");
this->fetch.setCPU(this);
this->decode.setCPU(this);
this->rename.setCPU(this);
this->iew.setCPU(this);
this->commit.setCPU(this);
this->rob.setCPU(this);
}
template <class Impl>
void
AlphaFullCPU<Impl>::regStats()
{
// Register stats for everything that has stats.
this->fullCPURegStats();
this->fetch.regStats();
this->decode.regStats();
this->rename.regStats();
this->iew.regStats();
this->commit.regStats();
}
#if !FULL_SYSTEM
// Will probably need to know which thread is calling syscall
// Will need to pass that information in to the DynInst when it is constructed,
// so that this call can be made with the proper thread number.
template <class Impl>
void
AlphaFullCPU<Impl>::syscall(short thread_num)
{
DPRINTF(FullCPU, "AlphaFullCPU: Syscall() called.\n\n");
// Commit stage needs to run as well.
this->commit.tick();
squashStages();
// Temporarily increase this by one to account for the syscall
// instruction.
++(this->funcExeInst);
// Copy over all important state to xc once all the unrolling is done.
copyToXC();
// This is hardcoded to thread 0 while the CPU is only single threaded.
this->thread[0]->syscall();
// Copy over all important state back to CPU.
copyFromXC();
// Decrease funcExeInst by one as the normal commit will handle
// incrememnting it.
--(this->funcExeInst);
}
// This is not a pretty function, and should only be used if it is necessary
// to fake having everything squash all at once (ie for non-full system
// syscalls). Maybe put this at the FullCPU level?
template <class Impl>
void
AlphaFullCPU<Impl>::squashStages()
{
InstSeqNum rob_head = this->rob.readHeadSeqNum();
// Now hack the time buffer to put this sequence number in the places
// where the stages might read it.
for (int i = 0; i < 5; ++i)
{
this->timeBuffer.access(-i)->commitInfo.doneSeqNum = rob_head;
}
this->fetch.squash(this->rob.readHeadNextPC());
this->fetchQueue.advance();
this->decode.squash();
this->decodeQueue.advance();
this->rename.squash();
this->renameQueue.advance();
this->renameQueue.advance();
// Be sure to advance the IEW queues so that the commit stage doesn't
// try to set an instruction as completed at the same time that it
// might be deleting it.
this->iew.squash();
this->iewQueue.advance();
this->iewQueue.advance();
// Needs to tell the LSQ to write back all of its data
this->iew.lsqWriteback();
this->rob.squash(rob_head);
this->commit.setSquashing();
// Now hack the time buffer to clear the sequence numbers in the places
// where the stages might read it.?
for (int i = 0; i < 5; ++i)
{
this->timeBuffer.access(-i)->commitInfo.doneSeqNum = 0;
}
}
#endif // FULL_SYSTEM
template <class Impl>
void
AlphaFullCPU<Impl>::copyToXC()
{
PhysRegIndex renamed_reg;
// First loop through the integer registers.
for (int i = 0; i < AlphaISA::NumIntRegs; ++i)
{
renamed_reg = this->renameMap.lookup(i);
this->cpuXC->setIntReg(i, this->regFile.readIntReg(renamed_reg));
DPRINTF(FullCPU, "FullCPU: Copying register %i, has data %lli.\n",
renamed_reg, this->regFile.intRegFile[renamed_reg]);
}
// Then loop through the floating point registers.
for (int i = 0; i < AlphaISA::NumFloatRegs; ++i)
{
renamed_reg = this->renameMap.lookup(i + AlphaISA::FP_Base_DepTag);
this->cpuXC->setFloatRegBits(i,
this->regFile.readFloatRegBits(renamed_reg));
}
this->cpuXC->setMiscReg(AlphaISA::Fpcr_DepTag,
this->regFile.readMiscReg(AlphaISA::Fpcr_DepTag));
this->cpuXC->setMiscReg(AlphaISA::Uniq_DepTag,
this->regFile.readMiscReg(AlphaISA::Uniq_DepTag));
this->cpuXC->setMiscReg(AlphaISA::Lock_Flag_DepTag,
this->regFile.readMiscReg(AlphaISA::Lock_Flag_DepTag));
this->cpuXC->setMiscReg(AlphaISA::Lock_Addr_DepTag,
this->regFile.readMiscReg(AlphaISA::Lock_Addr_DepTag));
this->cpuXC->setPC(this->rob.readHeadPC());
this->cpuXC->setNextPC(this->cpuXC->readPC()+4);
#if !FULL_SYSTEM
this->cpuXC->setFuncExeInst(this->funcExeInst);
#endif
}
// This function will probably mess things up unless the ROB is empty and
// there are no instructions in the pipeline.
template <class Impl>
void
AlphaFullCPU<Impl>::copyFromXC()
{
PhysRegIndex renamed_reg;
// First loop through the integer registers.
for (int i = 0; i < AlphaISA::NumIntRegs; ++i)
{
renamed_reg = this->renameMap.lookup(i);
DPRINTF(FullCPU, "FullCPU: Copying over register %i, had data %lli, "
"now has data %lli.\n",
renamed_reg, this->regFile.intRegFile[renamed_reg],
this->cpuXC->readIntReg(i));
this->regFile.setIntReg(renamed_reg, this->cpuXC->readIntReg(i));
}
// Then loop through the floating point registers.
for (int i = 0; i < AlphaISA::NumFloatRegs; ++i)
{
renamed_reg = this->renameMap.lookup(i + AlphaISA::FP_Base_DepTag);
this->regFile.setFloatRegBits(renamed_reg,
this->cpuXC->readFloatRegBits(i));
}
// Then loop through the misc registers.
this->regFile.setMiscReg(AlphaISA::Fpcr_DepTag,
this->cpuXC->readMiscReg(AlphaISA::Fpcr_DepTag));
this->regFile.setMiscReg(AlphaISA::Uniq_DepTag,
this->cpuXC->readMiscReg(AlphaISA::Uniq_DepTag));
this->regFile.setMiscReg(AlphaISA::Lock_Flag_DepTag,
this->cpuXC->readMiscReg(AlphaISA::Lock_Flag_DepTag));
this->regFile.setMiscReg(AlphaISA::Lock_Addr_DepTag,
this->cpuXC->readMiscReg(AlphaISA::Lock_Addr_DepTag));
// Then finally set the PC and the next PC.
// regFile.pc = cpuXC->regs.pc;
// regFile.npc = cpuXC->regs.npc;
#if !FULL_SYSTEM
this->funcExeInst = this->cpuXC->readFuncExeInst();
#endif
}
#if FULL_SYSTEM
template <class Impl>
int
AlphaFullCPU<Impl>::readIntrFlag()
{
return this->regFile.readIntrFlag();
}
template <class Impl>
void
AlphaFullCPU<Impl>::setIntrFlag(int val)
{
this->regFile.setIntrFlag(val);
}
// Can force commit stage to squash and stuff.
template <class Impl>
Fault
AlphaFullCPU<Impl>::hwrei()
{
if (!inPalMode())
return new AlphaISA::UnimplementedOpcodeFault;
this->setNextPC(this->regFile.miscRegs.readReg(AlphaISA::IPR_EXC_ADDR));
// kernelStats.hwrei();
if ((this->regFile.miscRegs.readReg(AlphaISA::IPR_EXC_ADDR) & 1) == 0)
// AlphaISA::swap_palshadow(&regs, false);
this->checkInterrupts = true;
// FIXME: XXX check for interrupts? XXX
return NoFault;
}
template <class Impl>
bool
AlphaFullCPU<Impl>::simPalCheck(int palFunc)
{
// kernelStats.callpal(palFunc);
switch (palFunc) {
case PAL::halt:
halt();
if (--System::numSystemsRunning == 0)
new SimExitEvent("all cpus halted");
break;
case PAL::bpt:
case PAL::bugchk:
if (this->system->breakpoint())
return false;
break;
}
return true;
}
// Probably shouldn't be able to switch to the trap handler as quickly as
// this. Also needs to get the exception restart address from the commit
// stage.
template <class Impl>
void
AlphaFullCPU<Impl>::trap(Fault fault)
{
/* // Keep in mind that a trap may be initiated by fetch if there's a TLB
// miss
uint64_t PC = this->commit.readCommitPC();
DPRINTF(Fault, "Fault %s\n", fault->name());
this->recordEvent(csprintf("Fault %s", fault->name()));
//kernelStats.fault(fault);
if (fault->isA<ArithmeticFault>())
panic("Arithmetic traps are unimplemented!");
// exception restart address - Get the commit PC
if (!fault->isA<InterruptFault>() || !inPalMode(PC))
this->regFile.miscRegs.setReg(AlphaISA::IPR_EXC_ADDR, PC);
if (fault->isA<PalFault>() || fault->isA<ArithmeticFault>())
// || fault == InterruptFault && !PC_PAL(regs.pc)
{
// traps... skip faulting instruction
AlphaISA::MiscReg ipr_exc_addr =
this->regFile.miscRegs.readReg(AlphaISA::IPR_EXC_ADDR);
this->regFile.miscRegs.setReg(AlphaISA::IPR_EXC_ADDR,
ipr_exc_addr + 4);
}
if (!inPalMode(PC))
swapPALShadow(true);
this->regFile.setPC(this->regFile.miscRegs.readReg(AlphaISA::IPR_PAL_BASE) +
(dynamic_cast<AlphaFault *>(fault.get()))->vect());
this->regFile.setNextPC(PC + sizeof(MachInst));*/
}
template <class Impl>
void
AlphaFullCPU<Impl>::processInterrupts()
{
// Check for interrupts here. For now can copy the code that exists
// within isa_fullsys_traits.hh.
}
// swap_palshadow swaps in the values of the shadow registers and
// swaps them with the values of the physical registers that map to the
// same logical index.
template <class Impl>
void
AlphaFullCPU<Impl>::swapPALShadow(bool use_shadow)
{
if (palShadowEnabled == use_shadow)
panic("swap_palshadow: wrong PAL shadow state");
palShadowEnabled = use_shadow;
// Will have to lookup in rename map to get physical registers, then
// swap.
}
#endif // FULL_SYSTEM