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gem5/cpu/beta_cpu/alpha_full_cpu_impl.hh
Kevin Lim 90d4436351 Slight fixes, add in commit trace flag. 
base/traceflags.py:
    Add new commit rate trace flag.
build/SConstruct:
    Add extra option for efence.
cpu/beta_cpu/alpha_full_cpu_impl.hh:
    Use function calls instead of direct indexing (avoids confusion).
cpu/beta_cpu/commit_impl.hh:
    Add commit rate trace output (might not be worthwhile in the future).
cpu/beta_cpu/decode_impl.hh:
    Remove some older hacks.  Fix it so that the isntruction properly sets its next
    PC to the one calculated by the branch.
cpu/beta_cpu/fetch_impl.hh:
    Remove old commented code.
cpu/beta_cpu/iew_impl.hh:
    Add extra check to ensure that the instruction is valid.
cpu/beta_cpu/regfile.hh:
    Include trace file.

--HG--
extra : convert_revision : 4ee1dc88f8a5ed9b65486c6c111a3718a8040e42
2005-01-11 18:52:29 -05:00

711 lines
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#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/beta_cpu/alpha_full_cpu.hh"
#include "cpu/beta_cpu/alpha_params.hh"
#include "cpu/beta_cpu/comm.hh"
template <class Impl>
AlphaFullCPU<Impl>::AlphaFullCPU(Params &params)
: FullBetaCPU<AlphaSimpleImpl>(params)
{
DPRINTF(FullCPU, "AlphaFullCPU: Creating AlphaFullCPU object.\n");
fetch.setCPU(this);
decode.setCPU(this);
rename.setCPU(this);
iew.setCPU(this);
commit.setCPU(this);
rob.setCPU(this);
}
template <class Impl>
void
AlphaFullCPU<Impl>::regStats()
{
// Register stats for everything that has stats.
fullCPURegStats();
fetch.regStats();
decode.regStats();
rename.regStats();
iew.regStats();
commit.regStats();
}
#ifndef FULL_SYSTEM
template <class Impl>
void
AlphaFullCPU<Impl>::syscall()
{
DPRINTF(FullCPU, "AlphaFullCPU: Syscall() called.\n\n");
// Commit stage needs to run as well.
commit.tick();
squashStages();
// Temporarily increase this by one to account for the syscall
// instruction.
++funcExeInst;
// Copy over all important state to xc once all the unrolling is done.
copyToXC();
process->syscall(xc);
// Copy over all important state back to CPU.
copyFromXC();
// Decrease funcExeInst by one as the normal commit will handle
// incrememnting it.
--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 = 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)
{
timeBuffer.access(-i)->commitInfo.doneSeqNum = rob_head;
}
fetch.squash(rob.readHeadNextPC());
fetchQueue.advance();
decode.squash();
decodeQueue.advance();
rename.squash();
renameQueue.advance();
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.
iew.squash();
iewQueue.advance();
iewQueue.advance();
rob.squash(rob_head);
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)
{
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 = renameMap.lookup(i);
xc->regs.intRegFile[i] = regFile.readIntReg(renamed_reg);
DPRINTF(FullCPU, "FullCPU: Copying register %i, has data %lli.\n",
renamed_reg, regFile.intRegFile[renamed_reg]);
}
// Then loop through the floating point registers.
for (int i = 0; i < AlphaISA::NumFloatRegs; ++i)
{
renamed_reg = renameMap.lookup(i + AlphaISA::FP_Base_DepTag);
xc->regs.floatRegFile.d[i] = regFile.readFloatRegDouble(renamed_reg);
xc->regs.floatRegFile.q[i] = regFile.readFloatRegInt(renamed_reg);
}
xc->regs.miscRegs.fpcr = regFile.miscRegs.fpcr;
xc->regs.miscRegs.uniq = regFile.miscRegs.uniq;
xc->regs.miscRegs.lock_flag = regFile.miscRegs.lock_flag;
xc->regs.miscRegs.lock_addr = regFile.miscRegs.lock_addr;
xc->regs.pc = rob.readHeadPC();
xc->regs.npc = xc->regs.pc+4;
xc->func_exe_inst = funcExeInst;
}
// 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 = renameMap.lookup(i);
DPRINTF(FullCPU, "FullCPU: Copying over register %i, had data %lli, "
"now has data %lli.\n",
renamed_reg, regFile.intRegFile[renamed_reg],
xc->regs.intRegFile[i]);
regFile.setIntReg(renamed_reg, xc->regs.intRegFile[i]);
}
// Then loop through the floating point registers.
for (int i = 0; i < AlphaISA::NumFloatRegs; ++i)
{
renamed_reg = renameMap.lookup(i + AlphaISA::FP_Base_DepTag);
regFile.setFloatRegDouble(renamed_reg, xc->regs.floatRegFile.d[i]);
regFile.setFloatRegInt(renamed_reg, xc->regs.floatRegFile.q[i]);
}
// Then loop through the misc registers.
regFile.miscRegs.fpcr = xc->regs.miscRegs.fpcr;
regFile.miscRegs.uniq = xc->regs.miscRegs.uniq;
regFile.miscRegs.lock_flag = xc->regs.miscRegs.lock_flag;
regFile.miscRegs.lock_addr = xc->regs.miscRegs.lock_addr;
// Then finally set the PC and the next PC.
// regFile.pc = xc->regs.pc;
// regFile.npc = xc->regs.npc;
funcExeInst = xc->func_exe_inst;
}
#ifdef FULL_SYSTEM
template <class Impl>
uint64_t *
AlphaFullCPU<Impl>::getIpr()
{
return regFile.getIpr();
}
template <class Impl>
uint64_t
AlphaFullCPU<Impl>::readIpr(int idx, Fault &fault)
{
uint64_t *ipr = getIpr();
uint64_t retval = 0; // return value, default 0
switch (idx) {
case AlphaISA::IPR_PALtemp0:
case AlphaISA::IPR_PALtemp1:
case AlphaISA::IPR_PALtemp2:
case AlphaISA::IPR_PALtemp3:
case AlphaISA::IPR_PALtemp4:
case AlphaISA::IPR_PALtemp5:
case AlphaISA::IPR_PALtemp6:
case AlphaISA::IPR_PALtemp7:
case AlphaISA::IPR_PALtemp8:
case AlphaISA::IPR_PALtemp9:
case AlphaISA::IPR_PALtemp10:
case AlphaISA::IPR_PALtemp11:
case AlphaISA::IPR_PALtemp12:
case AlphaISA::IPR_PALtemp13:
case AlphaISA::IPR_PALtemp14:
case AlphaISA::IPR_PALtemp15:
case AlphaISA::IPR_PALtemp16:
case AlphaISA::IPR_PALtemp17:
case AlphaISA::IPR_PALtemp18:
case AlphaISA::IPR_PALtemp19:
case AlphaISA::IPR_PALtemp20:
case AlphaISA::IPR_PALtemp21:
case AlphaISA::IPR_PALtemp22:
case AlphaISA::IPR_PALtemp23:
case AlphaISA::IPR_PAL_BASE:
case AlphaISA::IPR_IVPTBR:
case AlphaISA::IPR_DC_MODE:
case AlphaISA::IPR_MAF_MODE:
case AlphaISA::IPR_ISR:
case AlphaISA::IPR_EXC_ADDR:
case AlphaISA::IPR_IC_PERR_STAT:
case AlphaISA::IPR_DC_PERR_STAT:
case AlphaISA::IPR_MCSR:
case AlphaISA::IPR_ASTRR:
case AlphaISA::IPR_ASTER:
case AlphaISA::IPR_SIRR:
case AlphaISA::IPR_ICSR:
case AlphaISA::IPR_ICM:
case AlphaISA::IPR_DTB_CM:
case AlphaISA::IPR_IPLR:
case AlphaISA::IPR_INTID:
case AlphaISA::IPR_PMCTR:
// no side-effect
retval = ipr[idx];
break;
case AlphaISA::IPR_CC:
retval |= ipr[idx] & ULL(0xffffffff00000000);
retval |= curTick & ULL(0x00000000ffffffff);
break;
case AlphaISA::IPR_VA:
retval = ipr[idx];
break;
case AlphaISA::IPR_VA_FORM:
case AlphaISA::IPR_MM_STAT:
case AlphaISA::IPR_IFAULT_VA_FORM:
case AlphaISA::IPR_EXC_MASK:
case AlphaISA::IPR_EXC_SUM:
retval = ipr[idx];
break;
case AlphaISA::IPR_DTB_PTE:
{
AlphaISA::PTE &pte = dtb->index(!misspeculating());
retval |= ((u_int64_t)pte.ppn & ULL(0x7ffffff)) << 32;
retval |= ((u_int64_t)pte.xre & ULL(0xf)) << 8;
retval |= ((u_int64_t)pte.xwe & ULL(0xf)) << 12;
retval |= ((u_int64_t)pte.fonr & ULL(0x1)) << 1;
retval |= ((u_int64_t)pte.fonw & ULL(0x1))<< 2;
retval |= ((u_int64_t)pte.asma & ULL(0x1)) << 4;
retval |= ((u_int64_t)pte.asn & ULL(0x7f)) << 57;
}
break;
// write only registers
case AlphaISA::IPR_HWINT_CLR:
case AlphaISA::IPR_SL_XMIT:
case AlphaISA::IPR_DC_FLUSH:
case AlphaISA::IPR_IC_FLUSH:
case AlphaISA::IPR_ALT_MODE:
case AlphaISA::IPR_DTB_IA:
case AlphaISA::IPR_DTB_IAP:
case AlphaISA::IPR_ITB_IA:
case AlphaISA::IPR_ITB_IAP:
fault = Unimplemented_Opcode_Fault;
break;
default:
// invalid IPR
fault = Unimplemented_Opcode_Fault;
break;
}
return retval;
}
template <class Impl>
Fault
AlphaFullCPU<Impl>::setIpr(int idx, uint64_t val)
{
uint64_t *ipr = getIpr();
uint64_t old;
if (misspeculating())
return No_Fault;
switch (idx) {
case AlphaISA::IPR_PALtemp0:
case AlphaISA::IPR_PALtemp1:
case AlphaISA::IPR_PALtemp2:
case AlphaISA::IPR_PALtemp3:
case AlphaISA::IPR_PALtemp4:
case AlphaISA::IPR_PALtemp5:
case AlphaISA::IPR_PALtemp6:
case AlphaISA::IPR_PALtemp7:
case AlphaISA::IPR_PALtemp8:
case AlphaISA::IPR_PALtemp9:
case AlphaISA::IPR_PALtemp10:
case AlphaISA::IPR_PALtemp11:
case AlphaISA::IPR_PALtemp12:
case AlphaISA::IPR_PALtemp13:
case AlphaISA::IPR_PALtemp14:
case AlphaISA::IPR_PALtemp15:
case AlphaISA::IPR_PALtemp16:
case AlphaISA::IPR_PALtemp17:
case AlphaISA::IPR_PALtemp18:
case AlphaISA::IPR_PALtemp19:
case AlphaISA::IPR_PALtemp20:
case AlphaISA::IPR_PALtemp21:
case AlphaISA::IPR_PALtemp22:
case AlphaISA::IPR_PAL_BASE:
case AlphaISA::IPR_IC_PERR_STAT:
case AlphaISA::IPR_DC_PERR_STAT:
case AlphaISA::IPR_PMCTR:
// write entire quad w/ no side-effect
ipr[idx] = val;
break;
case AlphaISA::IPR_CC_CTL:
// This IPR resets the cycle counter. We assume this only
// happens once... let's verify that.
assert(ipr[idx] == 0);
ipr[idx] = 1;
break;
case AlphaISA::IPR_CC:
// This IPR only writes the upper 64 bits. It's ok to write
// all 64 here since we mask out the lower 32 in rpcc (see
// isa_desc).
ipr[idx] = val;
break;
case AlphaISA::IPR_PALtemp23:
// write entire quad w/ no side-effect
old = ipr[idx];
ipr[idx] = val;
kernelStats.context(old, val);
break;
case AlphaISA::IPR_DTB_PTE:
// write entire quad w/ no side-effect, tag is forthcoming
ipr[idx] = val;
break;
case AlphaISA::IPR_EXC_ADDR:
// second least significant bit in PC is always zero
ipr[idx] = val & ~2;
break;
case AlphaISA::IPR_ASTRR:
case AlphaISA::IPR_ASTER:
// only write least significant four bits - privilege mask
ipr[idx] = val & 0xf;
break;
case AlphaISA::IPR_IPLR:
#ifdef DEBUG
if (break_ipl != -1 && break_ipl == (val & 0x1f))
debug_break();
#endif
// only write least significant five bits - interrupt level
ipr[idx] = val & 0x1f;
kernelStats.swpipl(ipr[idx]);
break;
case AlphaISA::IPR_DTB_CM:
kernelStats.mode((val & 0x18) != 0);
case AlphaISA::IPR_ICM:
// only write two mode bits - processor mode
ipr[idx] = val & 0x18;
break;
case AlphaISA::IPR_ALT_MODE:
// only write two mode bits - processor mode
ipr[idx] = val & 0x18;
break;
case AlphaISA::IPR_MCSR:
// more here after optimization...
ipr[idx] = val;
break;
case AlphaISA::IPR_SIRR:
// only write software interrupt mask
ipr[idx] = val & 0x7fff0;
break;
case AlphaISA::IPR_ICSR:
ipr[idx] = val & ULL(0xffffff0300);
break;
case AlphaISA::IPR_IVPTBR:
case AlphaISA::IPR_MVPTBR:
ipr[idx] = val & ULL(0xffffffffc0000000);
break;
case AlphaISA::IPR_DC_TEST_CTL:
ipr[idx] = val & 0x1ffb;
break;
case AlphaISA::IPR_DC_MODE:
case AlphaISA::IPR_MAF_MODE:
ipr[idx] = val & 0x3f;
break;
case AlphaISA::IPR_ITB_ASN:
ipr[idx] = val & 0x7f0;
break;
case AlphaISA::IPR_DTB_ASN:
ipr[idx] = val & ULL(0xfe00000000000000);
break;
case AlphaISA::IPR_EXC_SUM:
case AlphaISA::IPR_EXC_MASK:
// any write to this register clears it
ipr[idx] = 0;
break;
case AlphaISA::IPR_INTID:
case AlphaISA::IPR_SL_RCV:
case AlphaISA::IPR_MM_STAT:
case AlphaISA::IPR_ITB_PTE_TEMP:
case AlphaISA::IPR_DTB_PTE_TEMP:
// read-only registers
return Unimplemented_Opcode_Fault;
case AlphaISA::IPR_HWINT_CLR:
case AlphaISA::IPR_SL_XMIT:
case AlphaISA::IPR_DC_FLUSH:
case AlphaISA::IPR_IC_FLUSH:
// the following are write only
ipr[idx] = val;
break;
case AlphaISA::IPR_DTB_IA:
// really a control write
ipr[idx] = 0;
dtb->flushAll();
break;
case AlphaISA::IPR_DTB_IAP:
// really a control write
ipr[idx] = 0;
dtb->flushProcesses();
break;
case AlphaISA::IPR_DTB_IS:
// really a control write
ipr[idx] = val;
dtb->flushAddr(val, DTB_ASN_ASN(ipr[AlphaISA::IPR_DTB_ASN]));
break;
case AlphaISA::IPR_DTB_TAG: {
struct AlphaISA::PTE pte;
// FIXME: granularity hints NYI...
if (DTB_PTE_GH(ipr[AlphaISA::IPR_DTB_PTE]) != 0)
panic("PTE GH field != 0");
// write entire quad
ipr[idx] = val;
// construct PTE for new entry
pte.ppn = DTB_PTE_PPN(ipr[AlphaISA::IPR_DTB_PTE]);
pte.xre = DTB_PTE_XRE(ipr[AlphaISA::IPR_DTB_PTE]);
pte.xwe = DTB_PTE_XWE(ipr[AlphaISA::IPR_DTB_PTE]);
pte.fonr = DTB_PTE_FONR(ipr[AlphaISA::IPR_DTB_PTE]);
pte.fonw = DTB_PTE_FONW(ipr[AlphaISA::IPR_DTB_PTE]);
pte.asma = DTB_PTE_ASMA(ipr[AlphaISA::IPR_DTB_PTE]);
pte.asn = DTB_ASN_ASN(ipr[AlphaISA::IPR_DTB_ASN]);
// insert new TAG/PTE value into data TLB
dtb->insert(val, pte);
}
break;
case AlphaISA::IPR_ITB_PTE: {
struct AlphaISA::PTE pte;
// FIXME: granularity hints NYI...
if (ITB_PTE_GH(val) != 0)
panic("PTE GH field != 0");
// write entire quad
ipr[idx] = val;
// construct PTE for new entry
pte.ppn = ITB_PTE_PPN(val);
pte.xre = ITB_PTE_XRE(val);
pte.xwe = 0;
pte.fonr = ITB_PTE_FONR(val);
pte.fonw = ITB_PTE_FONW(val);
pte.asma = ITB_PTE_ASMA(val);
pte.asn = ITB_ASN_ASN(ipr[AlphaISA::IPR_ITB_ASN]);
// insert new TAG/PTE value into data TLB
itb->insert(ipr[AlphaISA::IPR_ITB_TAG], pte);
}
break;
case AlphaISA::IPR_ITB_IA:
// really a control write
ipr[idx] = 0;
itb->flushAll();
break;
case AlphaISA::IPR_ITB_IAP:
// really a control write
ipr[idx] = 0;
itb->flushProcesses();
break;
case AlphaISA::IPR_ITB_IS:
// really a control write
ipr[idx] = val;
itb->flushAddr(val, ITB_ASN_ASN(ipr[AlphaISA::IPR_ITB_ASN]));
break;
default:
// invalid IPR
return Unimplemented_Opcode_Fault;
}
// no error...
return No_Fault;
}
template <class Impl>
int
AlphaFullCPU<Impl>::readIntrFlag()
{
return regs.intrflag;
}
template <class Impl>
void
AlphaFullCPU<Impl>::setIntrFlag(int val)
{
regs.intrflag = val;
}
// Can force commit stage to squash and stuff.
template <class Impl>
Fault
AlphaFullCPU<Impl>::hwrei()
{
uint64_t *ipr = getIpr();
if (!PC_PAL(regs.pc))
return Unimplemented_Opcode_Fault;
setNextPC(ipr[AlphaISA::IPR_EXC_ADDR]);
if (!misspeculating()) {
kernelStats.hwrei();
if ((ipr[AlphaISA::IPR_EXC_ADDR] & 1) == 0)
AlphaISA::swap_palshadow(&regs, false);
AlphaISA::check_interrupts = true;
}
// FIXME: XXX check for interrupts? XXX
return No_Fault;
}
template <class Impl>
bool
AlphaFullCPU<Impl>::inPalMode()
{
return PC_PAL(readPC());
}
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 (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)
{
uint64_t PC = commit.readPC();
DPRINTF(Fault, "Fault %s\n", FaultName(fault));
Stats::recordEvent(csprintf("Fault %s", FaultName(fault)));
assert(!misspeculating());
kernelStats.fault(fault);
if (fault == Arithmetic_Fault)
panic("Arithmetic traps are unimplemented!");
AlphaISA::InternalProcReg *ipr = getIpr();
// exception restart address - Get the commit PC
if (fault != Interrupt_Fault || !PC_PAL(PC))
ipr[AlphaISA::IPR_EXC_ADDR] = PC;
if (fault == Pal_Fault || fault == Arithmetic_Fault /* ||
fault == Interrupt_Fault && !PC_PAL(regs.pc) */) {
// traps... skip faulting instruction
ipr[AlphaISA::IPR_EXC_ADDR] += 4;
}
if (!PC_PAL(PC))
AlphaISA::swap_palshadow(&regs, true);
setPC( ipr[AlphaISA::IPR_PAL_BASE] + AlphaISA::fault_addr[fault] );
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>::swap_palshadow(RegFile *regs, 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.
for (int i = 0; i < AlphaISA::NumIntRegs; i++) {
if (reg_redir[i]) {
AlphaISA::IntReg temp = regs->intRegFile[i];
regs->intRegFile[i] = regs->palregs[i];
regs->palregs[i] = temp;
}
}
}
#endif // FULL_SYSTEM
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