summaryrefslogtreecommitdiff
path: root/src/arch/arm/tlb.cc
diff options
context:
space:
mode:
Diffstat (limited to 'src/arch/arm/tlb.cc')
-rw-r--r--src/arch/arm/tlb.cc364
1 files changed, 364 insertions, 0 deletions
diff --git a/src/arch/arm/tlb.cc b/src/arch/arm/tlb.cc
new file mode 100644
index 000000000..d0cc57a1d
--- /dev/null
+++ b/src/arch/arm/tlb.cc
@@ -0,0 +1,364 @@
+/*
+ * Copyright (c) 2001-2005 The Regents of The University of Michigan
+ * Copyright (c) 2007 MIPS Technologies, Inc.
+ * Copyright (c) 2007-2008 The Florida State University
+ * 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: Nathan Binkert
+ * Steve Reinhardt
+ * Stephen Hines
+ */
+
+#include <string>
+#include <vector>
+
+#include "arch/arm/pagetable.hh"
+#include "arch/arm/tlb.hh"
+#include "arch/arm/faults.hh"
+#include "arch/arm/utility.hh"
+#include "base/inifile.hh"
+#include "base/str.hh"
+#include "base/trace.hh"
+#include "cpu/thread_context.hh"
+#include "sim/process.hh"
+#include "mem/page_table.hh"
+#include "params/ArmDTB.hh"
+#include "params/ArmITB.hh"
+#include "params/ArmTLB.hh"
+#include "params/ArmUTB.hh"
+
+
+using namespace std;
+using namespace ArmISA;
+
+///////////////////////////////////////////////////////////////////////
+//
+// ARM TLB
+//
+
+#define MODE2MASK(X) (1 << (X))
+
+TLB::TLB(const Params *p)
+ : BaseTLB(p), size(p->size), nlu(0)
+{
+ table = new ArmISA::PTE[size];
+ memset(table, 0, sizeof(ArmISA::PTE[size]));
+ smallPages=0;
+}
+
+TLB::~TLB()
+{
+ if (table)
+ delete [] table;
+}
+
+// look up an entry in the TLB
+ArmISA::PTE *
+TLB::lookup(Addr vpn, uint8_t asn) const
+{
+ // assume not found...
+ ArmISA::PTE *retval = NULL;
+ PageTable::const_iterator i = lookupTable.find(vpn);
+ if (i != lookupTable.end()) {
+ while (i->first == vpn) {
+ int index = i->second;
+ ArmISA::PTE *pte = &table[index];
+
+ /* 1KB TLB Lookup code - from ARM ARM Volume III - Rev. 2.50 */
+ Addr Mask = pte->Mask;
+ Addr InvMask = ~Mask;
+ Addr VPN = pte->VPN;
+ // warn("Valid: %d - %d\n",pte->V0,pte->V1);
+ if(((vpn & InvMask) == (VPN & InvMask)) && (pte->G || (asn == pte->asid)))
+ { // We have a VPN + ASID Match
+ retval = pte;
+ break;
+ }
+ ++i;
+ }
+ }
+
+ DPRINTF(TLB, "lookup %#x, asn %#x -> %s ppn %#x\n", vpn, (int)asn,
+ retval ? "hit" : "miss", retval ? retval->PFN1 : 0);
+ return retval;
+}
+
+ArmISA::PTE* TLB::getEntry(unsigned Index) const
+{
+ // Make sure that Index is valid
+ assert(Index<size);
+ return &table[Index];
+}
+
+int TLB::probeEntry(Addr vpn,uint8_t asn) const
+{
+ // assume not found...
+ ArmISA::PTE *retval = NULL;
+ int Ind=-1;
+ PageTable::const_iterator i = lookupTable.find(vpn);
+ if (i != lookupTable.end()) {
+ while (i->first == vpn) {
+ int index = i->second;
+ ArmISA::PTE *pte = &table[index];
+
+ /* 1KB TLB Lookup code - from ARM ARM Volume III - Rev. 2.50 */
+ Addr Mask = pte->Mask;
+ Addr InvMask = ~Mask;
+ Addr VPN = pte->VPN;
+ if(((vpn & InvMask) == (VPN & InvMask)) && (pte->G || (asn == pte->asid)))
+ { // We have a VPN + ASID Match
+ retval = pte;
+ Ind = index;
+ break;
+ }
+
+ ++i;
+ }
+ }
+ DPRINTF(Arm,"VPN: %x, asid: %d, Result of TLBP: %d\n",vpn,asn,Ind);
+ return Ind;
+}
+Fault inline
+TLB::checkCacheability(RequestPtr &req)
+{
+ Addr VAddrUncacheable = 0xA0000000;
+ // In ARM, cacheability is controlled by certain bits of the virtual address
+ // or by the TLB entry
+ if((req->getVaddr() & VAddrUncacheable) == VAddrUncacheable) {
+ // mark request as uncacheable
+ req->setFlags(req->getFlags() | UNCACHEABLE);
+ }
+ return NoFault;
+}
+void TLB::insertAt(ArmISA::PTE &pte, unsigned Index, int _smallPages)
+{
+ smallPages=_smallPages;
+ if(Index > size){
+ warn("Attempted to write at index (%d) beyond TLB size (%d)",Index,size);
+ } else {
+ // Update TLB
+ DPRINTF(TLB,"TLB[%d]: %x %x %x %x\n",Index,pte.Mask<<11,((pte.VPN << 11) | pte.asid),((pte.PFN0 <<6) | (pte.C0 << 3) | (pte.D0 << 2) | (pte.V0 <<1) | pte.G),
+ ((pte.PFN1 <<6) | (pte.C1 << 3) | (pte.D1 << 2) | (pte.V1 <<1) | pte.G));
+ if(table[Index].V0 == true || table[Index].V1 == true){ // Previous entry is valid
+ PageTable::iterator i = lookupTable.find(table[Index].VPN);
+ lookupTable.erase(i);
+ }
+ table[Index]=pte;
+ // Update fast lookup table
+ lookupTable.insert(make_pair(table[Index].VPN, Index));
+ // int TestIndex=probeEntry(pte.VPN,pte.asid);
+ // warn("Inserted at: %d, Found at: %d (%x)\n",Index,TestIndex,pte.Mask);
+ }
+
+}
+
+// insert a new TLB entry
+void
+TLB::insert(Addr addr, ArmISA::PTE &pte)
+{
+ fatal("TLB Insert not yet implemented\n");
+}
+
+void
+TLB::flushAll()
+{
+ DPRINTF(TLB, "flushAll\n");
+ memset(table, 0, sizeof(ArmISA::PTE[size]));
+ lookupTable.clear();
+ nlu = 0;
+}
+
+void
+TLB::serialize(ostream &os)
+{
+ SERIALIZE_SCALAR(size);
+ SERIALIZE_SCALAR(nlu);
+
+ for (int i = 0; i < size; i++) {
+ nameOut(os, csprintf("%s.PTE%d", name(), i));
+ table[i].serialize(os);
+ }
+}
+
+void
+TLB::unserialize(Checkpoint *cp, const string &section)
+{
+ UNSERIALIZE_SCALAR(size);
+ UNSERIALIZE_SCALAR(nlu);
+
+ for (int i = 0; i < size; i++) {
+ table[i].unserialize(cp, csprintf("%s.PTE%d", section, i));
+ if (table[i].V0 || table[i].V1) {
+ lookupTable.insert(make_pair(table[i].VPN, i));
+ }
+ }
+}
+
+void
+TLB::regStats()
+{
+ read_hits
+ .name(name() + ".read_hits")
+ .desc("DTB read hits")
+ ;
+
+ read_misses
+ .name(name() + ".read_misses")
+ .desc("DTB read misses")
+ ;
+
+
+ read_accesses
+ .name(name() + ".read_accesses")
+ .desc("DTB read accesses")
+ ;
+
+ write_hits
+ .name(name() + ".write_hits")
+ .desc("DTB write hits")
+ ;
+
+ write_misses
+ .name(name() + ".write_misses")
+ .desc("DTB write misses")
+ ;
+
+
+ write_accesses
+ .name(name() + ".write_accesses")
+ .desc("DTB write accesses")
+ ;
+
+ hits
+ .name(name() + ".hits")
+ .desc("DTB hits")
+ ;
+
+ misses
+ .name(name() + ".misses")
+ .desc("DTB misses")
+ ;
+
+ invalids
+ .name(name() + ".invalids")
+ .desc("DTB access violations")
+ ;
+
+ accesses
+ .name(name() + ".accesses")
+ .desc("DTB accesses")
+ ;
+
+ hits = read_hits + write_hits;
+ misses = read_misses + write_misses;
+ accesses = read_accesses + write_accesses;
+}
+
+Fault
+ITB::translate(RequestPtr &req, ThreadContext *tc)
+{
+#if !FULL_SYSTEM
+ Process * p = tc->getProcessPtr();
+
+ Fault fault = p->pTable->translate(req);
+ if(fault != NoFault)
+ return fault;
+
+ return NoFault;
+#else
+ fatal("ITB translate not yet implemented\n");
+#endif
+}
+
+Fault
+DTB::translate(RequestPtr &req, ThreadContext *tc, bool write)
+{
+#if !FULL_SYSTEM
+ Process * p = tc->getProcessPtr();
+
+ Fault fault = p->pTable->translate(req);
+ if(fault != NoFault)
+ return fault;
+
+ return NoFault;
+#else
+ fatal("DTB translate not yet implemented\n");
+#endif
+}
+
+///////////////////////////////////////////////////////////////////////
+//
+// Arm ITB
+//
+ITB::ITB(const Params *p)
+ : TLB(p)
+{}
+
+
+///////////////////////////////////////////////////////////////////////
+//
+// Arm DTB
+//
+DTB::DTB(const Params *p)
+ : TLB(p)
+{}
+
+///////////////////////////////////////////////////////////////////////
+//
+// Arm UTB
+//
+UTB::UTB(const Params *p)
+ : ITB(p), DTB(p)
+{}
+
+ArmISA::PTE &
+TLB::index(bool advance)
+{
+ ArmISA::PTE *pte = &table[nlu];
+
+ if (advance)
+ nextnlu();
+
+ return *pte;
+}
+
+ArmISA::ITB *
+ArmITBParams::create()
+{
+ return new ArmISA::ITB(this);
+}
+
+ArmISA::DTB *
+ArmDTBParams::create()
+{
+ return new ArmISA::DTB(this);
+}
+
+ArmISA::UTB *
+ArmUTBParams::create()
+{
+ return new ArmISA::UTB(this);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-30 07:15:25 +0000