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+/*
+ * Copyright (c) 2002-2005 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.
+ *
+ * Authors: Steve Reinhardt
+ */
+
+#include "arch/utility.hh"
+#include "base/cprintf.hh"
+#include "base/inifile.hh"
+#include "base/loader/symtab.hh"
+#include "base/misc.hh"
+#include "base/pollevent.hh"
+#include "base/range.hh"
+#include "base/stats/events.hh"
+#include "base/trace.hh"
+#include "cpu/base.hh"
+#include "cpu/exetrace.hh"
+#include "cpu/profile.hh"
+#include "cpu/sampler/sampler.hh"
+#include "cpu/simple/base.hh"
+#include "cpu/simple_thread.hh"
+#include "cpu/smt.hh"
+#include "cpu/static_inst.hh"
+#include "cpu/thread_context.hh"
+#include "kern/kernel_stats.hh"
+#include "mem/packet_impl.hh"
+#include "sim/builder.hh"
+#include "sim/byteswap.hh"
+#include "sim/debug.hh"
+#include "sim/host.hh"
+#include "sim/sim_events.hh"
+#include "sim/sim_object.hh"
+#include "sim/stats.hh"
+
+#if FULL_SYSTEM
+#include "base/remote_gdb.hh"
+#include "sim/system.hh"
+#include "arch/tlb.hh"
+#include "arch/stacktrace.hh"
+#include "arch/vtophys.hh"
+#else // !FULL_SYSTEM
+#include "mem/mem_object.hh"
+#endif // FULL_SYSTEM
+
+using namespace std;
+using namespace TheISA;
+
+BaseSimpleCPU::BaseSimpleCPU(Params *p)
+ : BaseCPU(p), mem(p->mem), thread(NULL)
+{
+#if FULL_SYSTEM
+ thread = new SimpleThread(this, 0, p->system, p->itb, p->dtb);
+#else
+ thread = new SimpleThread(this, /* thread_num */ 0, p->process,
+ /* asid */ 0, mem);
+#endif // !FULL_SYSTEM
+
+ thread->setStatus(ThreadContext::Suspended);
+
+ tc = thread->getTC();
+
+ numInst = 0;
+ startNumInst = 0;
+ numLoad = 0;
+ startNumLoad = 0;
+ lastIcacheStall = 0;
+ lastDcacheStall = 0;
+
+ threadContexts.push_back(tc);
+}
+
+BaseSimpleCPU::~BaseSimpleCPU()
+{
+}
+
+void
+BaseSimpleCPU::deallocateContext(int thread_num)
+{
+ // for now, these are equivalent
+ suspendContext(thread_num);
+}
+
+
+void
+BaseSimpleCPU::haltContext(int thread_num)
+{
+ // for now, these are equivalent
+ suspendContext(thread_num);
+}
+
+
+void
+BaseSimpleCPU::regStats()
+{
+ using namespace Stats;
+
+ BaseCPU::regStats();
+
+ numInsts
+ .name(name() + ".num_insts")
+ .desc("Number of instructions executed")
+ ;
+
+ numMemRefs
+ .name(name() + ".num_refs")
+ .desc("Number of memory references")
+ ;
+
+ notIdleFraction
+ .name(name() + ".not_idle_fraction")
+ .desc("Percentage of non-idle cycles")
+ ;
+
+ idleFraction
+ .name(name() + ".idle_fraction")
+ .desc("Percentage of idle cycles")
+ ;
+
+ icacheStallCycles
+ .name(name() + ".icache_stall_cycles")
+ .desc("ICache total stall cycles")
+ .prereq(icacheStallCycles)
+ ;
+
+ dcacheStallCycles
+ .name(name() + ".dcache_stall_cycles")
+ .desc("DCache total stall cycles")
+ .prereq(dcacheStallCycles)
+ ;
+
+ icacheRetryCycles
+ .name(name() + ".icache_retry_cycles")
+ .desc("ICache total retry cycles")
+ .prereq(icacheRetryCycles)
+ ;
+
+ dcacheRetryCycles
+ .name(name() + ".dcache_retry_cycles")
+ .desc("DCache total retry cycles")
+ .prereq(dcacheRetryCycles)
+ ;
+
+ idleFraction = constant(1.0) - notIdleFraction;
+}
+
+void
+BaseSimpleCPU::resetStats()
+{
+ startNumInst = numInst;
+ // notIdleFraction = (_status != Idle);
+}
+
+void
+BaseSimpleCPU::serialize(ostream &os)
+{
+ BaseCPU::serialize(os);
+ SERIALIZE_SCALAR(inst);
+ nameOut(os, csprintf("%s.xc", name()));
+ thread->serialize(os);
+}
+
+void
+BaseSimpleCPU::unserialize(Checkpoint *cp, const string &section)
+{
+ BaseCPU::unserialize(cp, section);
+ UNSERIALIZE_SCALAR(inst);
+ thread->unserialize(cp, csprintf("%s.xc", section));
+}
+
+void
+change_thread_state(int thread_number, int activate, int priority)
+{
+}
+
+Fault
+BaseSimpleCPU::copySrcTranslate(Addr src)
+{
+#if 0
+ static bool no_warn = true;
+ int blk_size = (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
+ // Only support block sizes of 64 atm.
+ assert(blk_size == 64);
+ int offset = src & (blk_size - 1);
+
+ // Make sure block doesn't span page
+ if (no_warn &&
+ (src & PageMask) != ((src + blk_size) & PageMask) &&
+ (src >> 40) != 0xfffffc) {
+ warn("Copied block source spans pages %x.", src);
+ no_warn = false;
+ }
+
+ memReq->reset(src & ~(blk_size - 1), blk_size);
+
+ // translate to physical address
+ Fault fault = thread->translateDataReadReq(req);
+
+ if (fault == NoFault) {
+ thread->copySrcAddr = src;
+ thread->copySrcPhysAddr = memReq->paddr + offset;
+ } else {
+ assert(!fault->isAlignmentFault());
+
+ thread->copySrcAddr = 0;
+ thread->copySrcPhysAddr = 0;
+ }
+ return fault;
+#else
+ return NoFault;
+#endif
+}
+
+Fault
+BaseSimpleCPU::copy(Addr dest)
+{
+#if 0
+ static bool no_warn = true;
+ int blk_size = (dcacheInterface) ? dcacheInterface->getBlockSize() : 64;
+ // Only support block sizes of 64 atm.
+ assert(blk_size == 64);
+ uint8_t data[blk_size];
+ //assert(thread->copySrcAddr);
+ int offset = dest & (blk_size - 1);
+
+ // Make sure block doesn't span page
+ if (no_warn &&
+ (dest & PageMask) != ((dest + blk_size) & PageMask) &&
+ (dest >> 40) != 0xfffffc) {
+ no_warn = false;
+ warn("Copied block destination spans pages %x. ", dest);
+ }
+
+ memReq->reset(dest & ~(blk_size -1), blk_size);
+ // translate to physical address
+ Fault fault = thread->translateDataWriteReq(req);
+
+ if (fault == NoFault) {
+ Addr dest_addr = memReq->paddr + offset;
+ // Need to read straight from memory since we have more than 8 bytes.
+ memReq->paddr = thread->copySrcPhysAddr;
+ thread->mem->read(memReq, data);
+ memReq->paddr = dest_addr;
+ thread->mem->write(memReq, data);
+ if (dcacheInterface) {
+ memReq->cmd = Copy;
+ memReq->completionEvent = NULL;
+ memReq->paddr = thread->copySrcPhysAddr;
+ memReq->dest = dest_addr;
+ memReq->size = 64;
+ memReq->time = curTick;
+ memReq->flags &= ~INST_READ;
+ dcacheInterface->access(memReq);
+ }
+ }
+ else
+ assert(!fault->isAlignmentFault());
+
+ return fault;
+#else
+ panic("copy not implemented");
+ return NoFault;
+#endif
+}
+
+#if FULL_SYSTEM
+Addr
+BaseSimpleCPU::dbg_vtophys(Addr addr)
+{
+ return vtophys(tc, addr);
+}
+#endif // FULL_SYSTEM
+
+#if FULL_SYSTEM
+void
+BaseSimpleCPU::post_interrupt(int int_num, int index)
+{
+ BaseCPU::post_interrupt(int_num, index);
+
+ if (thread->status() == ThreadContext::Suspended) {
+ DPRINTF(IPI,"Suspended Processor awoke\n");
+ thread->activate();
+ }
+}
+#endif // FULL_SYSTEM
+
+void
+BaseSimpleCPU::checkForInterrupts()
+{
+#if FULL_SYSTEM
+ if (checkInterrupts && check_interrupts() && !thread->inPalMode()) {
+ int ipl = 0;
+ int summary = 0;
+ checkInterrupts = false;
+
+ if (thread->readMiscReg(IPR_SIRR)) {
+ for (int i = INTLEVEL_SOFTWARE_MIN;
+ i < INTLEVEL_SOFTWARE_MAX; i++) {
+ if (thread->readMiscReg(IPR_SIRR) & (ULL(1) << i)) {
+ // See table 4-19 of 21164 hardware reference
+ ipl = (i - INTLEVEL_SOFTWARE_MIN) + 1;
+ summary |= (ULL(1) << i);
+ }
+ }
+ }
+
+ uint64_t interrupts = thread->cpu->intr_status();
+ for (int i = INTLEVEL_EXTERNAL_MIN;
+ i < INTLEVEL_EXTERNAL_MAX; i++) {
+ if (interrupts & (ULL(1) << i)) {
+ // See table 4-19 of 21164 hardware reference
+ ipl = i;
+ summary |= (ULL(1) << i);
+ }
+ }
+
+ if (thread->readMiscReg(IPR_ASTRR))
+ panic("asynchronous traps not implemented\n");
+
+ if (ipl && ipl > thread->readMiscReg(IPR_IPLR)) {
+ thread->setMiscReg(IPR_ISR, summary);
+ thread->setMiscReg(IPR_INTID, ipl);
+
+ Fault(new InterruptFault)->invoke(tc);
+
+ DPRINTF(Flow, "Interrupt! IPLR=%d ipl=%d summary=%x\n",
+ thread->readMiscReg(IPR_IPLR), ipl, summary);
+ }
+ }
+#endif
+}
+
+
+Fault
+BaseSimpleCPU::setupFetchRequest(Request *req)
+{
+ // set up memory request for instruction fetch
+ DPRINTF(Fetch,"Fetch: PC:%08p NPC:%08p NNPC:%08p\n",thread->readPC(),
+ thread->readNextPC(),thread->readNextNPC());
+
+ req->setVirt(0, thread->readPC() & ~3, sizeof(MachInst),
+ (FULL_SYSTEM && (thread->readPC() & 1)) ? PHYSICAL : 0,
+ thread->readPC());
+
+ Fault fault = thread->translateInstReq(req);
+
+ return fault;
+}
+
+
+void
+BaseSimpleCPU::preExecute()
+{
+ // maintain $r0 semantics
+ thread->setIntReg(ZeroReg, 0);
+#if THE_ISA == ALPHA_ISA
+ thread->setFloatReg(ZeroReg, 0.0);
+#endif // ALPHA_ISA
+
+ // keep an instruction count
+ numInst++;
+ numInsts++;
+
+ thread->funcExeInst++;
+
+ // check for instruction-count-based events
+ comInstEventQueue[0]->serviceEvents(numInst);
+
+ // decode the instruction
+ inst = gtoh(inst);
+ curStaticInst = StaticInst::decode(makeExtMI(inst, thread->readPC()));
+
+ traceData = Trace::getInstRecord(curTick, tc, this, curStaticInst,
+ thread->readPC());
+
+ DPRINTF(Decode,"Decode: Decoded %s instruction (opcode: 0x%x): 0x%x\n",
+ curStaticInst->getName(), curStaticInst->getOpcode(),
+ curStaticInst->machInst);
+
+#if FULL_SYSTEM
+ thread->setInst(inst);
+#endif // FULL_SYSTEM
+}
+
+void
+BaseSimpleCPU::postExecute()
+{
+#if FULL_SYSTEM
+ if (thread->profile) {
+ bool usermode =
+ (thread->readMiscReg(AlphaISA::IPR_DTB_CM) & 0x18) != 0;
+ thread->profilePC = usermode ? 1 : thread->readPC();
+ ProfileNode *node = thread->profile->consume(tc, inst);
+ if (node)
+ thread->profileNode = node;
+ }
+#endif
+
+ if (curStaticInst->isMemRef()) {
+ numMemRefs++;
+ }
+
+ if (curStaticInst->isLoad()) {
+ ++numLoad;
+ comLoadEventQueue[0]->serviceEvents(numLoad);
+ }
+
+ traceFunctions(thread->readPC());
+
+ if (traceData) {
+ traceData->finalize();
+ }
+}
+
+
+void
+BaseSimpleCPU::advancePC(Fault fault)
+{
+ if (fault != NoFault) {
+#if FULL_SYSTEM
+ fault->invoke(tc);
+#else // !FULL_SYSTEM
+ fatal("fault (%s) detected @ PC %08p", fault->name(), thread->readPC());
+#endif // FULL_SYSTEM
+ }
+ else {
+ // go to the next instruction
+ thread->setPC(thread->readNextPC());
+#if THE_ISA == ALPHA_ISA
+ thread->setNextPC(thread->readNextPC() + sizeof(MachInst));
+#else
+ thread->setNextPC(thread->readNextNPC());
+ thread->setNextNPC(thread->readNextNPC() + sizeof(MachInst));
+#endif
+
+ }
+
+#if FULL_SYSTEM
+ Addr oldpc;
+ do {
+ oldpc = thread->readPC();
+ system->pcEventQueue.service(tc);
+ } while (oldpc != thread->readPC());
+#endif
+}
+
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