| /* |
| * Copyright (c) 2010-2013, 2016-2019 ARM Limited |
| * All rights reserved |
| * |
| * The license below extends only to copyright in the software and shall |
| * not be construed as granting a license to any other intellectual |
| * property including but not limited to intellectual property relating |
| * to a hardware implementation of the functionality of the software |
| * licensed hereunder. You may use the software subject to the license |
| * terms below provided that you ensure that this notice is replicated |
| * unmodified and in its entirety in all distributions of the software, |
| * modified or unmodified, in source code or in binary form. |
| * |
| * Copyright (c) 2001-2005 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: Ali Saidi |
| * Nathan Binkert |
| * Steve Reinhardt |
| */ |
| |
| #include "arch/arm/tlb.hh" |
| |
| #include <memory> |
| #include <string> |
| #include <vector> |
| |
| #include "arch/arm/faults.hh" |
| #include "arch/arm/pagetable.hh" |
| #include "arch/arm/stage2_lookup.hh" |
| #include "arch/arm/stage2_mmu.hh" |
| #include "arch/arm/system.hh" |
| #include "arch/arm/table_walker.hh" |
| #include "arch/arm/utility.hh" |
| #include "base/inifile.hh" |
| #include "base/str.hh" |
| #include "base/trace.hh" |
| #include "cpu/base.hh" |
| #include "cpu/thread_context.hh" |
| #include "debug/Checkpoint.hh" |
| #include "debug/TLB.hh" |
| #include "debug/TLBVerbose.hh" |
| #include "mem/page_table.hh" |
| #include "mem/request.hh" |
| #include "params/ArmTLB.hh" |
| #include "sim/full_system.hh" |
| #include "sim/process.hh" |
| |
| using namespace std; |
| using namespace ArmISA; |
| |
| TLB::TLB(const ArmTLBParams *p) |
| : BaseTLB(p), table(new TlbEntry[p->size]), size(p->size), |
| isStage2(p->is_stage2), stage2Req(false), stage2DescReq(false), _attr(0), |
| directToStage2(false), tableWalker(p->walker), stage2Tlb(NULL), |
| stage2Mmu(NULL), test(nullptr), rangeMRU(1), |
| aarch64(false), aarch64EL(EL0), isPriv(false), isSecure(false), |
| isHyp(false), asid(0), vmid(0), hcr(0), dacr(0), |
| miscRegValid(false), miscRegContext(0), curTranType(NormalTran) |
| { |
| const ArmSystem *sys = dynamic_cast<const ArmSystem *>(p->sys); |
| |
| tableWalker->setTlb(this); |
| |
| // Cache system-level properties |
| haveLPAE = tableWalker->haveLPAE(); |
| haveVirtualization = tableWalker->haveVirtualization(); |
| haveLargeAsid64 = tableWalker->haveLargeAsid64(); |
| |
| if (sys) |
| m5opRange = sys->m5opRange(); |
| } |
| |
| TLB::~TLB() |
| { |
| delete[] table; |
| } |
| |
| void |
| TLB::init() |
| { |
| if (stage2Mmu && !isStage2) |
| stage2Tlb = stage2Mmu->stage2Tlb(); |
| } |
| |
| void |
| TLB::setMMU(Stage2MMU *m, MasterID master_id) |
| { |
| stage2Mmu = m; |
| tableWalker->setMMU(m, master_id); |
| } |
| |
| bool |
| TLB::translateFunctional(ThreadContext *tc, Addr va, Addr &pa) |
| { |
| updateMiscReg(tc); |
| |
| if (directToStage2) { |
| assert(stage2Tlb); |
| return stage2Tlb->translateFunctional(tc, va, pa); |
| } |
| |
| TlbEntry *e = lookup(va, asid, vmid, isHyp, isSecure, true, false, |
| aarch64 ? aarch64EL : EL1); |
| if (!e) |
| return false; |
| pa = e->pAddr(va); |
| return true; |
| } |
| |
| Fault |
| TLB::finalizePhysical(const RequestPtr &req, |
| ThreadContext *tc, Mode mode) const |
| { |
| const Addr paddr = req->getPaddr(); |
| |
| if (m5opRange.contains(paddr)) |
| req->setFlags(Request::MMAPPED_IPR); |
| |
| return NoFault; |
| } |
| |
| TlbEntry* |
| TLB::lookup(Addr va, uint16_t asn, uint8_t vmid, bool hyp, bool secure, |
| bool functional, bool ignore_asn, ExceptionLevel target_el) |
| { |
| |
| TlbEntry *retval = NULL; |
| |
| // Maintaining LRU array |
| int x = 0; |
| while (retval == NULL && x < size) { |
| if ((!ignore_asn && table[x].match(va, asn, vmid, hyp, secure, false, |
| target_el)) || |
| (ignore_asn && table[x].match(va, vmid, hyp, secure, target_el))) { |
| // We only move the hit entry ahead when the position is higher |
| // than rangeMRU |
| if (x > rangeMRU && !functional) { |
| TlbEntry tmp_entry = table[x]; |
| for (int i = x; i > 0; i--) |
| table[i] = table[i - 1]; |
| table[0] = tmp_entry; |
| retval = &table[0]; |
| } else { |
| retval = &table[x]; |
| } |
| break; |
| } |
| ++x; |
| } |
| |
| DPRINTF(TLBVerbose, "Lookup %#x, asn %#x -> %s vmn 0x%x hyp %d secure %d " |
| "ppn %#x size: %#x pa: %#x ap:%d ns:%d nstid:%d g:%d asid: %d " |
| "el: %d\n", |
| va, asn, retval ? "hit" : "miss", vmid, hyp, secure, |
| retval ? retval->pfn : 0, retval ? retval->size : 0, |
| retval ? retval->pAddr(va) : 0, retval ? retval->ap : 0, |
| retval ? retval->ns : 0, retval ? retval->nstid : 0, |
| retval ? retval->global : 0, retval ? retval->asid : 0, |
| retval ? retval->el : 0); |
| |
| return retval; |
| } |
| |
| // insert a new TLB entry |
| void |
| TLB::insert(Addr addr, TlbEntry &entry) |
| { |
| DPRINTF(TLB, "Inserting entry into TLB with pfn:%#x size:%#x vpn: %#x" |
| " asid:%d vmid:%d N:%d global:%d valid:%d nc:%d xn:%d" |
| " ap:%#x domain:%#x ns:%d nstid:%d isHyp:%d\n", entry.pfn, |
| entry.size, entry.vpn, entry.asid, entry.vmid, entry.N, |
| entry.global, entry.valid, entry.nonCacheable, entry.xn, |
| entry.ap, static_cast<uint8_t>(entry.domain), entry.ns, entry.nstid, |
| entry.isHyp); |
| |
| if (table[size - 1].valid) |
| DPRINTF(TLB, " - Replacing Valid entry %#x, asn %d vmn %d ppn %#x " |
| "size: %#x ap:%d ns:%d nstid:%d g:%d isHyp:%d el: %d\n", |
| table[size-1].vpn << table[size-1].N, table[size-1].asid, |
| table[size-1].vmid, table[size-1].pfn << table[size-1].N, |
| table[size-1].size, table[size-1].ap, table[size-1].ns, |
| table[size-1].nstid, table[size-1].global, table[size-1].isHyp, |
| table[size-1].el); |
| |
| //inserting to MRU position and evicting the LRU one |
| |
| for (int i = size - 1; i > 0; --i) |
| table[i] = table[i-1]; |
| table[0] = entry; |
| |
| inserts++; |
| ppRefills->notify(1); |
| } |
| |
| void |
| TLB::printTlb() const |
| { |
| int x = 0; |
| TlbEntry *te; |
| DPRINTF(TLB, "Current TLB contents:\n"); |
| while (x < size) { |
| te = &table[x]; |
| if (te->valid) |
| DPRINTF(TLB, " * %s\n", te->print()); |
| ++x; |
| } |
| } |
| |
| void |
| TLB::flushAllSecurity(bool secure_lookup, ExceptionLevel target_el, |
| bool ignore_el) |
| { |
| DPRINTF(TLB, "Flushing all TLB entries (%s lookup)\n", |
| (secure_lookup ? "secure" : "non-secure")); |
| int x = 0; |
| TlbEntry *te; |
| while (x < size) { |
| te = &table[x]; |
| const bool el_match = ignore_el ? |
| true : te->checkELMatch(target_el); |
| |
| if (te->valid && secure_lookup == !te->nstid && |
| (te->vmid == vmid || secure_lookup) && el_match) { |
| |
| DPRINTF(TLB, " - %s\n", te->print()); |
| te->valid = false; |
| flushedEntries++; |
| } |
| ++x; |
| } |
| |
| flushTlb++; |
| |
| // If there's a second stage TLB (and we're not it) then flush it as well |
| // if we're currently in hyp mode |
| if (!isStage2 && isHyp) { |
| stage2Tlb->flushAllSecurity(secure_lookup, EL1, true); |
| } |
| } |
| |
| void |
| TLB::flushAllNs(ExceptionLevel target_el, bool ignore_el) |
| { |
| bool hyp = target_el == EL2; |
| |
| DPRINTF(TLB, "Flushing all NS TLB entries (%s lookup)\n", |
| (hyp ? "hyp" : "non-hyp")); |
| int x = 0; |
| TlbEntry *te; |
| while (x < size) { |
| te = &table[x]; |
| const bool el_match = ignore_el ? |
| true : te->checkELMatch(target_el); |
| |
| if (te->valid && te->nstid && te->isHyp == hyp && el_match) { |
| |
| DPRINTF(TLB, " - %s\n", te->print()); |
| flushedEntries++; |
| te->valid = false; |
| } |
| ++x; |
| } |
| |
| flushTlb++; |
| |
| // If there's a second stage TLB (and we're not it) then flush it as well |
| if (!isStage2 && !hyp) { |
| stage2Tlb->flushAllNs(EL1, true); |
| } |
| } |
| |
| void |
| TLB::flushMvaAsid(Addr mva, uint64_t asn, bool secure_lookup, |
| ExceptionLevel target_el) |
| { |
| DPRINTF(TLB, "Flushing TLB entries with mva: %#x, asid: %#x " |
| "(%s lookup)\n", mva, asn, (secure_lookup ? |
| "secure" : "non-secure")); |
| _flushMva(mva, asn, secure_lookup, false, target_el); |
| flushTlbMvaAsid++; |
| } |
| |
| void |
| TLB::flushAsid(uint64_t asn, bool secure_lookup, ExceptionLevel target_el) |
| { |
| DPRINTF(TLB, "Flushing TLB entries with asid: %#x (%s lookup)\n", asn, |
| (secure_lookup ? "secure" : "non-secure")); |
| |
| int x = 0 ; |
| TlbEntry *te; |
| |
| while (x < size) { |
| te = &table[x]; |
| if (te->valid && te->asid == asn && secure_lookup == !te->nstid && |
| (te->vmid == vmid || secure_lookup) && |
| te->checkELMatch(target_el)) { |
| |
| te->valid = false; |
| DPRINTF(TLB, " - %s\n", te->print()); |
| flushedEntries++; |
| } |
| ++x; |
| } |
| flushTlbAsid++; |
| } |
| |
| void |
| TLB::flushMva(Addr mva, bool secure_lookup, ExceptionLevel target_el) |
| { |
| DPRINTF(TLB, "Flushing TLB entries with mva: %#x (%s lookup)\n", mva, |
| (secure_lookup ? "secure" : "non-secure")); |
| _flushMva(mva, 0xbeef, secure_lookup, true, target_el); |
| flushTlbMva++; |
| } |
| |
| void |
| TLB::_flushMva(Addr mva, uint64_t asn, bool secure_lookup, |
| bool ignore_asn, ExceptionLevel target_el) |
| { |
| TlbEntry *te; |
| // D5.7.2: Sign-extend address to 64 bits |
| mva = sext<56>(mva); |
| |
| bool hyp = target_el == EL2; |
| |
| te = lookup(mva, asn, vmid, hyp, secure_lookup, false, ignore_asn, |
| target_el); |
| while (te != NULL) { |
| if (secure_lookup == !te->nstid) { |
| DPRINTF(TLB, " - %s\n", te->print()); |
| te->valid = false; |
| flushedEntries++; |
| } |
| te = lookup(mva, asn, vmid, hyp, secure_lookup, false, ignore_asn, |
| target_el); |
| } |
| } |
| |
| void |
| TLB::flushIpaVmid(Addr ipa, bool secure_lookup, ExceptionLevel target_el) |
| { |
| assert(!isStage2); |
| stage2Tlb->_flushMva(ipa, 0xbeef, secure_lookup, true, target_el); |
| } |
| |
| void |
| TLB::drainResume() |
| { |
| // We might have unserialized something or switched CPUs, so make |
| // sure to re-read the misc regs. |
| miscRegValid = false; |
| } |
| |
| void |
| TLB::takeOverFrom(BaseTLB *_otlb) |
| { |
| TLB *otlb = dynamic_cast<TLB*>(_otlb); |
| /* Make sure we actually have a valid type */ |
| if (otlb) { |
| _attr = otlb->_attr; |
| haveLPAE = otlb->haveLPAE; |
| directToStage2 = otlb->directToStage2; |
| stage2Req = otlb->stage2Req; |
| stage2DescReq = otlb->stage2DescReq; |
| |
| /* Sync the stage2 MMU if they exist in both |
| * the old CPU and the new |
| */ |
| if (!isStage2 && |
| stage2Tlb && otlb->stage2Tlb) { |
| stage2Tlb->takeOverFrom(otlb->stage2Tlb); |
| } |
| } else { |
| panic("Incompatible TLB type!"); |
| } |
| } |
| |
| void |
| TLB::regStats() |
| { |
| BaseTLB::regStats(); |
| instHits |
| .name(name() + ".inst_hits") |
| .desc("ITB inst hits") |
| ; |
| |
| instMisses |
| .name(name() + ".inst_misses") |
| .desc("ITB inst misses") |
| ; |
| |
| instAccesses |
| .name(name() + ".inst_accesses") |
| .desc("ITB inst accesses") |
| ; |
| |
| readHits |
| .name(name() + ".read_hits") |
| .desc("DTB read hits") |
| ; |
| |
| readMisses |
| .name(name() + ".read_misses") |
| .desc("DTB read misses") |
| ; |
| |
| readAccesses |
| .name(name() + ".read_accesses") |
| .desc("DTB read accesses") |
| ; |
| |
| writeHits |
| .name(name() + ".write_hits") |
| .desc("DTB write hits") |
| ; |
| |
| writeMisses |
| .name(name() + ".write_misses") |
| .desc("DTB write misses") |
| ; |
| |
| writeAccesses |
| .name(name() + ".write_accesses") |
| .desc("DTB write accesses") |
| ; |
| |
| hits |
| .name(name() + ".hits") |
| .desc("DTB hits") |
| ; |
| |
| misses |
| .name(name() + ".misses") |
| .desc("DTB misses") |
| ; |
| |
| accesses |
| .name(name() + ".accesses") |
| .desc("DTB accesses") |
| ; |
| |
| flushTlb |
| .name(name() + ".flush_tlb") |
| .desc("Number of times complete TLB was flushed") |
| ; |
| |
| flushTlbMva |
| .name(name() + ".flush_tlb_mva") |
| .desc("Number of times TLB was flushed by MVA") |
| ; |
| |
| flushTlbMvaAsid |
| .name(name() + ".flush_tlb_mva_asid") |
| .desc("Number of times TLB was flushed by MVA & ASID") |
| ; |
| |
| flushTlbAsid |
| .name(name() + ".flush_tlb_asid") |
| .desc("Number of times TLB was flushed by ASID") |
| ; |
| |
| flushedEntries |
| .name(name() + ".flush_entries") |
| .desc("Number of entries that have been flushed from TLB") |
| ; |
| |
| alignFaults |
| .name(name() + ".align_faults") |
| .desc("Number of TLB faults due to alignment restrictions") |
| ; |
| |
| prefetchFaults |
| .name(name() + ".prefetch_faults") |
| .desc("Number of TLB faults due to prefetch") |
| ; |
| |
| domainFaults |
| .name(name() + ".domain_faults") |
| .desc("Number of TLB faults due to domain restrictions") |
| ; |
| |
| permsFaults |
| .name(name() + ".perms_faults") |
| .desc("Number of TLB faults due to permissions restrictions") |
| ; |
| |
| instAccesses = instHits + instMisses; |
| readAccesses = readHits + readMisses; |
| writeAccesses = writeHits + writeMisses; |
| hits = readHits + writeHits + instHits; |
| misses = readMisses + writeMisses + instMisses; |
| accesses = readAccesses + writeAccesses + instAccesses; |
| } |
| |
| void |
| TLB::regProbePoints() |
| { |
| ppRefills.reset(new ProbePoints::PMU(getProbeManager(), "Refills")); |
| } |
| |
| Fault |
| TLB::translateSe(const RequestPtr &req, ThreadContext *tc, Mode mode, |
| Translation *translation, bool &delay, bool timing) |
| { |
| updateMiscReg(tc); |
| Addr vaddr_tainted = req->getVaddr(); |
| Addr vaddr = 0; |
| if (aarch64) |
| vaddr = purifyTaggedAddr(vaddr_tainted, tc, aarch64EL, (TCR)ttbcr, |
| mode==Execute); |
| else |
| vaddr = vaddr_tainted; |
| Request::Flags flags = req->getFlags(); |
| |
| bool is_fetch = (mode == Execute); |
| bool is_write = (mode == Write); |
| |
| if (!is_fetch) { |
| assert(flags & MustBeOne || req->isPrefetch()); |
| if (sctlr.a || !(flags & AllowUnaligned)) { |
| if (vaddr & mask(flags & AlignmentMask)) { |
| // LPAE is always disabled in SE mode |
| return std::make_shared<DataAbort>( |
| vaddr_tainted, |
| TlbEntry::DomainType::NoAccess, is_write, |
| ArmFault::AlignmentFault, isStage2, |
| ArmFault::VmsaTran); |
| } |
| } |
| } |
| |
| Addr paddr; |
| Process *p = tc->getProcessPtr(); |
| |
| if (!p->pTable->translate(vaddr, paddr)) |
| return std::make_shared<GenericPageTableFault>(vaddr_tainted); |
| req->setPaddr(paddr); |
| |
| return finalizePhysical(req, tc, mode); |
| } |
| |
| Fault |
| TLB::checkPermissions(TlbEntry *te, const RequestPtr &req, Mode mode) |
| { |
| // a data cache maintenance instruction that operates by MVA does |
| // not generate a Data Abort exeception due to a Permission fault |
| if (req->isCacheMaintenance()) { |
| return NoFault; |
| } |
| |
| Addr vaddr = req->getVaddr(); // 32-bit don't have to purify |
| Request::Flags flags = req->getFlags(); |
| bool is_fetch = (mode == Execute); |
| bool is_write = (mode == Write); |
| bool is_priv = isPriv && !(flags & UserMode); |
| |
| // Get the translation type from the actuall table entry |
| ArmFault::TranMethod tranMethod = te->longDescFormat ? ArmFault::LpaeTran |
| : ArmFault::VmsaTran; |
| |
| // If this is the second stage of translation and the request is for a |
| // stage 1 page table walk then we need to check the HCR.PTW bit. This |
| // allows us to generate a fault if the request targets an area marked |
| // as a device or strongly ordered. |
| if (isStage2 && req->isPTWalk() && hcr.ptw && |
| (te->mtype != TlbEntry::MemoryType::Normal)) { |
| return std::make_shared<DataAbort>( |
| vaddr, te->domain, is_write, |
| ArmFault::PermissionLL + te->lookupLevel, |
| isStage2, tranMethod); |
| } |
| |
| // Generate an alignment fault for unaligned data accesses to device or |
| // strongly ordered memory |
| if (!is_fetch) { |
| if (te->mtype != TlbEntry::MemoryType::Normal) { |
| if (vaddr & mask(flags & AlignmentMask)) { |
| alignFaults++; |
| return std::make_shared<DataAbort>( |
| vaddr, TlbEntry::DomainType::NoAccess, is_write, |
| ArmFault::AlignmentFault, isStage2, |
| tranMethod); |
| } |
| } |
| } |
| |
| if (te->nonCacheable) { |
| // Prevent prefetching from I/O devices. |
| if (req->isPrefetch()) { |
| // Here we can safely use the fault status for the short |
| // desc. format in all cases |
| return std::make_shared<PrefetchAbort>( |
| vaddr, ArmFault::PrefetchUncacheable, |
| isStage2, tranMethod); |
| } |
| } |
| |
| if (!te->longDescFormat) { |
| switch ((dacr >> (static_cast<uint8_t>(te->domain) * 2)) & 0x3) { |
| case 0: |
| domainFaults++; |
| DPRINTF(TLB, "TLB Fault: Data abort on domain. DACR: %#x" |
| " domain: %#x write:%d\n", dacr, |
| static_cast<uint8_t>(te->domain), is_write); |
| if (is_fetch) { |
| // Use PC value instead of vaddr because vaddr might |
| // be aligned to cache line and should not be the |
| // address reported in FAR |
| return std::make_shared<PrefetchAbort>( |
| req->getPC(), |
| ArmFault::DomainLL + te->lookupLevel, |
| isStage2, tranMethod); |
| } else |
| return std::make_shared<DataAbort>( |
| vaddr, te->domain, is_write, |
| ArmFault::DomainLL + te->lookupLevel, |
| isStage2, tranMethod); |
| case 1: |
| // Continue with permissions check |
| break; |
| case 2: |
| panic("UNPRED domain\n"); |
| case 3: |
| return NoFault; |
| } |
| } |
| |
| // The 'ap' variable is AP[2:0] or {AP[2,1],1b'0}, i.e. always three bits |
| uint8_t ap = te->longDescFormat ? te->ap << 1 : te->ap; |
| uint8_t hap = te->hap; |
| |
| if (sctlr.afe == 1 || te->longDescFormat) |
| ap |= 1; |
| |
| bool abt; |
| bool isWritable = true; |
| // If this is a stage 2 access (eg for reading stage 1 page table entries) |
| // then don't perform the AP permissions check, we stil do the HAP check |
| // below. |
| if (isStage2) { |
| abt = false; |
| } else { |
| switch (ap) { |
| case 0: |
| DPRINTF(TLB, "Access permissions 0, checking rs:%#x\n", |
| (int)sctlr.rs); |
| if (!sctlr.xp) { |
| switch ((int)sctlr.rs) { |
| case 2: |
| abt = is_write; |
| break; |
| case 1: |
| abt = is_write || !is_priv; |
| break; |
| case 0: |
| case 3: |
| default: |
| abt = true; |
| break; |
| } |
| } else { |
| abt = true; |
| } |
| break; |
| case 1: |
| abt = !is_priv; |
| break; |
| case 2: |
| abt = !is_priv && is_write; |
| isWritable = is_priv; |
| break; |
| case 3: |
| abt = false; |
| break; |
| case 4: |
| panic("UNPRED premissions\n"); |
| case 5: |
| abt = !is_priv || is_write; |
| isWritable = false; |
| break; |
| case 6: |
| case 7: |
| abt = is_write; |
| isWritable = false; |
| break; |
| default: |
| panic("Unknown permissions %#x\n", ap); |
| } |
| } |
| |
| bool hapAbt = is_write ? !(hap & 2) : !(hap & 1); |
| bool xn = te->xn || (isWritable && sctlr.wxn) || |
| (ap == 3 && sctlr.uwxn && is_priv); |
| if (is_fetch && (abt || xn || |
| (te->longDescFormat && te->pxn && is_priv) || |
| (isSecure && te->ns && scr.sif))) { |
| permsFaults++; |
| DPRINTF(TLB, "TLB Fault: Prefetch abort on permission check. AP:%d " |
| "priv:%d write:%d ns:%d sif:%d sctlr.afe: %d \n", |
| ap, is_priv, is_write, te->ns, scr.sif,sctlr.afe); |
| // Use PC value instead of vaddr because vaddr might be aligned to |
| // cache line and should not be the address reported in FAR |
| return std::make_shared<PrefetchAbort>( |
| req->getPC(), |
| ArmFault::PermissionLL + te->lookupLevel, |
| isStage2, tranMethod); |
| } else if (abt | hapAbt) { |
| permsFaults++; |
| DPRINTF(TLB, "TLB Fault: Data abort on permission check. AP:%d priv:%d" |
| " write:%d\n", ap, is_priv, is_write); |
| return std::make_shared<DataAbort>( |
| vaddr, te->domain, is_write, |
| ArmFault::PermissionLL + te->lookupLevel, |
| isStage2 | !abt, tranMethod); |
| } |
| return NoFault; |
| } |
| |
| |
| Fault |
| TLB::checkPermissions64(TlbEntry *te, const RequestPtr &req, Mode mode, |
| ThreadContext *tc) |
| { |
| assert(aarch64); |
| |
| // A data cache maintenance instruction that operates by VA does |
| // not generate a Permission fault unless: |
| // * It is a data cache invalidate (dc ivac) which requires write |
| // permissions to the VA, or |
| // * It is executed from EL0 |
| if (req->isCacheClean() && aarch64EL != EL0 && !isStage2) { |
| return NoFault; |
| } |
| |
| Addr vaddr_tainted = req->getVaddr(); |
| Addr vaddr = purifyTaggedAddr(vaddr_tainted, tc, aarch64EL, (TCR)ttbcr, |
| mode==Execute); |
| |
| Request::Flags flags = req->getFlags(); |
| bool is_fetch = (mode == Execute); |
| // Cache clean operations require read permissions to the specified VA |
| bool is_write = !req->isCacheClean() && mode == Write; |
| bool is_atomic = req->isAtomic(); |
| bool is_priv M5_VAR_USED = isPriv && !(flags & UserMode); |
| |
| updateMiscReg(tc, curTranType); |
| |
| // If this is the second stage of translation and the request is for a |
| // stage 1 page table walk then we need to check the HCR.PTW bit. This |
| // allows us to generate a fault if the request targets an area marked |
| // as a device or strongly ordered. |
| if (isStage2 && req->isPTWalk() && hcr.ptw && |
| (te->mtype != TlbEntry::MemoryType::Normal)) { |
| return std::make_shared<DataAbort>( |
| vaddr_tainted, te->domain, is_write, |
| ArmFault::PermissionLL + te->lookupLevel, |
| isStage2, ArmFault::LpaeTran); |
| } |
| |
| // Generate an alignment fault for unaligned accesses to device or |
| // strongly ordered memory |
| if (!is_fetch) { |
| if (te->mtype != TlbEntry::MemoryType::Normal) { |
| if (vaddr & mask(flags & AlignmentMask)) { |
| alignFaults++; |
| return std::make_shared<DataAbort>( |
| vaddr_tainted, |
| TlbEntry::DomainType::NoAccess, |
| is_atomic ? false : is_write, |
| ArmFault::AlignmentFault, isStage2, |
| ArmFault::LpaeTran); |
| } |
| } |
| } |
| |
| if (te->nonCacheable) { |
| // Prevent prefetching from I/O devices. |
| if (req->isPrefetch()) { |
| // Here we can safely use the fault status for the short |
| // desc. format in all cases |
| return std::make_shared<PrefetchAbort>( |
| vaddr_tainted, |
| ArmFault::PrefetchUncacheable, |
| isStage2, ArmFault::LpaeTran); |
| } |
| } |
| |
| uint8_t ap = 0x3 & (te->ap); // 2-bit access protection field |
| bool grant = false; |
| |
| uint8_t xn = te->xn; |
| uint8_t pxn = te->pxn; |
| bool r = !is_write && !is_fetch; |
| bool w = is_write; |
| bool x = is_fetch; |
| |
| // grant_read is used for faults from an atomic instruction that |
| // both reads and writes from a memory location. From a ISS point |
| // of view they count as read if a read to that address would have |
| // generated the fault; they count as writes otherwise |
| bool grant_read = true; |
| DPRINTF(TLBVerbose, "Checking permissions: ap:%d, xn:%d, pxn:%d, r:%d, " |
| "w:%d, x:%d\n", ap, xn, pxn, r, w, x); |
| |
| if (isStage2) { |
| assert(ArmSystem::haveVirtualization(tc) && aarch64EL != EL2); |
| // In stage 2 we use the hypervisor access permission bits. |
| // The following permissions are described in ARM DDI 0487A.f |
| // D4-1802 |
| uint8_t hap = 0x3 & te->hap; |
| grant_read = hap & 0x1; |
| if (is_fetch) { |
| // sctlr.wxn overrides the xn bit |
| grant = !sctlr.wxn && !xn; |
| } else if (is_write) { |
| grant = hap & 0x2; |
| } else { // is_read |
| grant = grant_read; |
| } |
| } else { |
| switch (aarch64EL) { |
| case EL0: |
| { |
| grant_read = ap & 0x1; |
| uint8_t perm = (ap << 2) | (xn << 1) | pxn; |
| switch (perm) { |
| case 0: |
| case 1: |
| case 8: |
| case 9: |
| grant = x; |
| break; |
| case 4: |
| case 5: |
| grant = r || w || (x && !sctlr.wxn); |
| break; |
| case 6: |
| case 7: |
| grant = r || w; |
| break; |
| case 12: |
| case 13: |
| grant = r || x; |
| break; |
| case 14: |
| case 15: |
| grant = r; |
| break; |
| default: |
| grant = false; |
| } |
| } |
| break; |
| case EL1: |
| { |
| if (checkPAN(tc, ap, req, mode)) { |
| grant = false; |
| grant_read = false; |
| break; |
| } |
| |
| uint8_t perm = (ap << 2) | (xn << 1) | pxn; |
| switch (perm) { |
| case 0: |
| case 2: |
| grant = r || w || (x && !sctlr.wxn); |
| break; |
| case 1: |
| case 3: |
| case 4: |
| case 5: |
| case 6: |
| case 7: |
| // regions that are writeable at EL0 should not be |
| // executable at EL1 |
| grant = r || w; |
| break; |
| case 8: |
| case 10: |
| case 12: |
| case 14: |
| grant = r || x; |
| break; |
| case 9: |
| case 11: |
| case 13: |
| case 15: |
| grant = r; |
| break; |
| default: |
| grant = false; |
| } |
| } |
| break; |
| case EL2: |
| if (hcr.e2h && checkPAN(tc, ap, req, mode)) { |
| grant = false; |
| grant_read = false; |
| break; |
| } |
| M5_FALLTHROUGH; |
| case EL3: |
| { |
| uint8_t perm = (ap & 0x2) | xn; |
| switch (perm) { |
| case 0: |
| grant = r || w || (x && !sctlr.wxn) ; |
| break; |
| case 1: |
| grant = r || w; |
| break; |
| case 2: |
| grant = r || x; |
| break; |
| case 3: |
| grant = r; |
| break; |
| default: |
| grant = false; |
| } |
| } |
| break; |
| } |
| } |
| |
| if (!grant) { |
| if (is_fetch) { |
| permsFaults++; |
| DPRINTF(TLB, "TLB Fault: Prefetch abort on permission check. " |
| "AP:%d priv:%d write:%d ns:%d sif:%d " |
| "sctlr.afe: %d\n", |
| ap, is_priv, is_write, te->ns, scr.sif, sctlr.afe); |
| // Use PC value instead of vaddr because vaddr might be aligned to |
| // cache line and should not be the address reported in FAR |
| return std::make_shared<PrefetchAbort>( |
| req->getPC(), |
| ArmFault::PermissionLL + te->lookupLevel, |
| isStage2, ArmFault::LpaeTran); |
| } else { |
| permsFaults++; |
| DPRINTF(TLB, "TLB Fault: Data abort on permission check. AP:%d " |
| "priv:%d write:%d\n", ap, is_priv, is_write); |
| return std::make_shared<DataAbort>( |
| vaddr_tainted, te->domain, |
| (is_atomic && !grant_read) ? false : is_write, |
| ArmFault::PermissionLL + te->lookupLevel, |
| isStage2, ArmFault::LpaeTran); |
| } |
| } |
| |
| return NoFault; |
| } |
| |
| bool |
| TLB::checkPAN(ThreadContext *tc, uint8_t ap, const RequestPtr &req, Mode mode) |
| { |
| // The PAN bit has no effect on: |
| // 1) Instruction accesses. |
| // 2) Data Cache instructions other than DC ZVA |
| // 3) Address translation instructions, other than ATS1E1RP and |
| // ATS1E1WP when ARMv8.2-ATS1E1 is implemented. (Unimplemented in |
| // gem5) |
| // 4) Unprivileged instructions (Unimplemented in gem5) |
| AA64MMFR1 mmfr1 = tc->readMiscReg(MISCREG_ID_AA64MMFR1_EL1); |
| if (mmfr1.pan && cpsr.pan && (ap & 0x1) && mode != Execute && |
| (!req->isCacheMaintenance() || |
| (req->getFlags() & Request::CACHE_BLOCK_ZERO))) { |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| Fault |
| TLB::translateMmuOff(ThreadContext *tc, const RequestPtr &req, Mode mode, |
| TLB::ArmTranslationType tranType, Addr vaddr, bool long_desc_format) |
| { |
| bool is_fetch = (mode == Execute); |
| req->setPaddr(vaddr); |
| // When the MMU is off the security attribute corresponds to the |
| // security state of the processor |
| if (isSecure) |
| req->setFlags(Request::SECURE); |
| |
| // @todo: double check this (ARM ARM issue C B3.2.1) |
| if (long_desc_format || sctlr.tre == 0 || nmrr.ir0 == 0 || |
| nmrr.or0 == 0 || prrr.tr0 != 0x2) { |
| if (!req->isCacheMaintenance()) { |
| req->setFlags(Request::UNCACHEABLE); |
| } |
| req->setFlags(Request::STRICT_ORDER); |
| } |
| |
| // Set memory attributes |
| TlbEntry temp_te; |
| temp_te.ns = !isSecure; |
| if (isStage2 || hcr.dc == 0 || isSecure || |
| (isHyp && !(tranType & S1CTran))) { |
| |
| temp_te.mtype = is_fetch ? TlbEntry::MemoryType::Normal |
| : TlbEntry::MemoryType::StronglyOrdered; |
| temp_te.innerAttrs = 0x0; |
| temp_te.outerAttrs = 0x0; |
| temp_te.shareable = true; |
| temp_te.outerShareable = true; |
| } else { |
| temp_te.mtype = TlbEntry::MemoryType::Normal; |
| temp_te.innerAttrs = 0x3; |
| temp_te.outerAttrs = 0x3; |
| temp_te.shareable = false; |
| temp_te.outerShareable = false; |
| } |
| temp_te.setAttributes(long_desc_format); |
| DPRINTF(TLBVerbose, "(No MMU) setting memory attributes: shareable: " |
| "%d, innerAttrs: %d, outerAttrs: %d, isStage2: %d\n", |
| temp_te.shareable, temp_te.innerAttrs, temp_te.outerAttrs, |
| isStage2); |
| setAttr(temp_te.attributes); |
| |
| return testTranslation(req, mode, TlbEntry::DomainType::NoAccess); |
| } |
| |
| Fault |
| TLB::translateMmuOn(ThreadContext* tc, const RequestPtr &req, Mode mode, |
| Translation *translation, bool &delay, bool timing, |
| bool functional, Addr vaddr, |
| ArmFault::TranMethod tranMethod) |
| { |
| TlbEntry *te = NULL; |
| bool is_fetch = (mode == Execute); |
| TlbEntry mergeTe; |
| |
| Request::Flags flags = req->getFlags(); |
| Addr vaddr_tainted = req->getVaddr(); |
| |
| Fault fault = getResultTe(&te, req, tc, mode, translation, timing, |
| functional, &mergeTe); |
| // only proceed if we have a valid table entry |
| if ((te == NULL) && (fault == NoFault)) delay = true; |
| |
| // If we have the table entry transfer some of the attributes to the |
| // request that triggered the translation |
| if (te != NULL) { |
| // Set memory attributes |
| DPRINTF(TLBVerbose, |
| "Setting memory attributes: shareable: %d, innerAttrs: %d, " |
| "outerAttrs: %d, mtype: %d, isStage2: %d\n", |
| te->shareable, te->innerAttrs, te->outerAttrs, |
| static_cast<uint8_t>(te->mtype), isStage2); |
| setAttr(te->attributes); |
| |
| if (te->nonCacheable && !req->isCacheMaintenance()) |
| req->setFlags(Request::UNCACHEABLE); |
| |
| // Require requests to be ordered if the request goes to |
| // strongly ordered or device memory (i.e., anything other |
| // than normal memory requires strict order). |
| if (te->mtype != TlbEntry::MemoryType::Normal) |
| req->setFlags(Request::STRICT_ORDER); |
| |
| Addr pa = te->pAddr(vaddr); |
| req->setPaddr(pa); |
| |
| if (isSecure && !te->ns) { |
| req->setFlags(Request::SECURE); |
| } |
| if ((!is_fetch) && (vaddr & mask(flags & AlignmentMask)) && |
| (te->mtype != TlbEntry::MemoryType::Normal)) { |
| // Unaligned accesses to Device memory should always cause an |
| // abort regardless of sctlr.a |
| alignFaults++; |
| bool is_write = (mode == Write); |
| return std::make_shared<DataAbort>( |
| vaddr_tainted, |
| TlbEntry::DomainType::NoAccess, is_write, |
| ArmFault::AlignmentFault, isStage2, |
| tranMethod); |
| } |
| |
| // Check for a trickbox generated address fault |
| if (fault == NoFault) |
| fault = testTranslation(req, mode, te->domain); |
| } |
| |
| if (fault == NoFault) { |
| // Don't try to finalize a physical address unless the |
| // translation has completed (i.e., there is a table entry). |
| return te ? finalizePhysical(req, tc, mode) : NoFault; |
| } else { |
| return fault; |
| } |
| } |
| |
| Fault |
| TLB::translateFs(const RequestPtr &req, ThreadContext *tc, Mode mode, |
| Translation *translation, bool &delay, bool timing, |
| TLB::ArmTranslationType tranType, bool functional) |
| { |
| // No such thing as a functional timing access |
| assert(!(timing && functional)); |
| |
| updateMiscReg(tc, tranType); |
| |
| Addr vaddr_tainted = req->getVaddr(); |
| Addr vaddr = 0; |
| if (aarch64) |
| vaddr = purifyTaggedAddr(vaddr_tainted, tc, aarch64EL, (TCR)ttbcr, |
| mode==Execute); |
| else |
| vaddr = vaddr_tainted; |
| Request::Flags flags = req->getFlags(); |
| |
| bool is_fetch = (mode == Execute); |
| bool is_write = (mode == Write); |
| bool long_desc_format = aarch64 || longDescFormatInUse(tc); |
| ArmFault::TranMethod tranMethod = long_desc_format ? ArmFault::LpaeTran |
| : ArmFault::VmsaTran; |
| |
| req->setAsid(asid); |
| |
| DPRINTF(TLBVerbose, "CPSR is priv:%d UserMode:%d secure:%d S1S2NsTran:%d\n", |
| isPriv, flags & UserMode, isSecure, tranType & S1S2NsTran); |
| |
| DPRINTF(TLB, "translateFs addr %#x, mode %d, st2 %d, scr %#x sctlr %#x " |
| "flags %#lx tranType 0x%x\n", vaddr_tainted, mode, isStage2, |
| scr, sctlr, flags, tranType); |
| |
| if ((req->isInstFetch() && (!sctlr.i)) || |
| ((!req->isInstFetch()) && (!sctlr.c))){ |
| if (!req->isCacheMaintenance()) { |
| req->setFlags(Request::UNCACHEABLE); |
| } |
| req->setFlags(Request::STRICT_ORDER); |
| } |
| if (!is_fetch) { |
| assert(flags & MustBeOne || req->isPrefetch()); |
| if (sctlr.a || !(flags & AllowUnaligned)) { |
| if (vaddr & mask(flags & AlignmentMask)) { |
| alignFaults++; |
| return std::make_shared<DataAbort>( |
| vaddr_tainted, |
| TlbEntry::DomainType::NoAccess, is_write, |
| ArmFault::AlignmentFault, isStage2, |
| tranMethod); |
| } |
| } |
| } |
| |
| // If guest MMU is off or hcr.vm=0 go straight to stage2 |
| if ((isStage2 && !hcr.vm) || (!isStage2 && !sctlr.m)) { |
| return translateMmuOff(tc, req, mode, tranType, vaddr, |
| long_desc_format); |
| } else { |
| DPRINTF(TLBVerbose, "Translating %s=%#x context=%d\n", |
| isStage2 ? "IPA" : "VA", vaddr_tainted, asid); |
| // Translation enabled |
| return translateMmuOn(tc, req, mode, translation, delay, timing, |
| functional, vaddr, tranMethod); |
| } |
| } |
| |
| Fault |
| TLB::translateAtomic(const RequestPtr &req, ThreadContext *tc, Mode mode, |
| TLB::ArmTranslationType tranType) |
| { |
| updateMiscReg(tc, tranType); |
| |
| if (directToStage2) { |
| assert(stage2Tlb); |
| return stage2Tlb->translateAtomic(req, tc, mode, tranType); |
| } |
| |
| bool delay = false; |
| Fault fault; |
| if (FullSystem) |
| fault = translateFs(req, tc, mode, NULL, delay, false, tranType); |
| else |
| fault = translateSe(req, tc, mode, NULL, delay, false); |
| assert(!delay); |
| return fault; |
| } |
| |
| Fault |
| TLB::translateFunctional(const RequestPtr &req, ThreadContext *tc, Mode mode, |
| TLB::ArmTranslationType tranType) |
| { |
| updateMiscReg(tc, tranType); |
| |
| if (directToStage2) { |
| assert(stage2Tlb); |
| return stage2Tlb->translateFunctional(req, tc, mode, tranType); |
| } |
| |
| bool delay = false; |
| Fault fault; |
| if (FullSystem) |
| fault = translateFs(req, tc, mode, NULL, delay, false, tranType, true); |
| else |
| fault = translateSe(req, tc, mode, NULL, delay, false); |
| assert(!delay); |
| return fault; |
| } |
| |
| void |
| TLB::translateTiming(const RequestPtr &req, ThreadContext *tc, |
| Translation *translation, Mode mode, TLB::ArmTranslationType tranType) |
| { |
| updateMiscReg(tc, tranType); |
| |
| if (directToStage2) { |
| assert(stage2Tlb); |
| stage2Tlb->translateTiming(req, tc, translation, mode, tranType); |
| return; |
| } |
| |
| assert(translation); |
| |
| translateComplete(req, tc, translation, mode, tranType, isStage2); |
| } |
| |
| Fault |
| TLB::translateComplete(const RequestPtr &req, ThreadContext *tc, |
| Translation *translation, Mode mode, TLB::ArmTranslationType tranType, |
| bool callFromS2) |
| { |
| bool delay = false; |
| Fault fault; |
| if (FullSystem) |
| fault = translateFs(req, tc, mode, translation, delay, true, tranType); |
| else |
| fault = translateSe(req, tc, mode, translation, delay, true); |
| DPRINTF(TLBVerbose, "Translation returning delay=%d fault=%d\n", delay, fault != |
| NoFault); |
| // If we have a translation, and we're not in the middle of doing a stage |
| // 2 translation tell the translation that we've either finished or its |
| // going to take a while. By not doing this when we're in the middle of a |
| // stage 2 translation we prevent marking the translation as delayed twice, |
| // one when the translation starts and again when the stage 1 translation |
| // completes. |
| if (translation && (callFromS2 || !stage2Req || req->hasPaddr() || fault != NoFault)) { |
| if (!delay) |
| translation->finish(fault, req, tc, mode); |
| else |
| translation->markDelayed(); |
| } |
| return fault; |
| } |
| |
| Port * |
| TLB::getTableWalkerPort() |
| { |
| return &stage2Mmu->getDMAPort(); |
| } |
| |
| void |
| TLB::updateMiscReg(ThreadContext *tc, ArmTranslationType tranType) |
| { |
| // check if the regs have changed, or the translation mode is different. |
| // NOTE: the tran type doesn't affect stage 2 TLB's as they only handle |
| // one type of translation anyway |
| if (miscRegValid && miscRegContext == tc->contextId() && |
| ((tranType == curTranType) || isStage2)) { |
| return; |
| } |
| |
| DPRINTF(TLBVerbose, "TLB variables changed!\n"); |
| cpsr = tc->readMiscReg(MISCREG_CPSR); |
| |
| // Dependencies: SCR/SCR_EL3, CPSR |
| isSecure = inSecureState(tc) && |
| !(tranType & HypMode) && !(tranType & S1S2NsTran); |
| |
| aarch64EL = tranTypeEL(cpsr, tranType); |
| aarch64 = isStage2 ? |
| ELIs64(tc, EL2) : |
| ELIs64(tc, aarch64EL == EL0 ? EL1 : aarch64EL); |
| |
| if (aarch64) { // AArch64 |
| // determine EL we need to translate in |
| switch (aarch64EL) { |
| case EL0: |
| case EL1: |
| { |
| sctlr = tc->readMiscReg(MISCREG_SCTLR_EL1); |
| ttbcr = tc->readMiscReg(MISCREG_TCR_EL1); |
| uint64_t ttbr_asid = ttbcr.a1 ? |
| tc->readMiscReg(MISCREG_TTBR1_EL1) : |
| tc->readMiscReg(MISCREG_TTBR0_EL1); |
| asid = bits(ttbr_asid, |
| (haveLargeAsid64 && ttbcr.as) ? 63 : 55, 48); |
| } |
| break; |
| case EL2: |
| sctlr = tc->readMiscReg(MISCREG_SCTLR_EL2); |
| ttbcr = tc->readMiscReg(MISCREG_TCR_EL2); |
| asid = -1; |
| break; |
| case EL3: |
| sctlr = tc->readMiscReg(MISCREG_SCTLR_EL3); |
| ttbcr = tc->readMiscReg(MISCREG_TCR_EL3); |
| asid = -1; |
| break; |
| } |
| hcr = tc->readMiscReg(MISCREG_HCR_EL2); |
| scr = tc->readMiscReg(MISCREG_SCR_EL3); |
| isPriv = aarch64EL != EL0; |
| if (haveVirtualization) { |
| vmid = bits(tc->readMiscReg(MISCREG_VTTBR_EL2), 55, 48); |
| isHyp = aarch64EL == EL2; |
| isHyp |= tranType & HypMode; |
| isHyp &= (tranType & S1S2NsTran) == 0; |
| isHyp &= (tranType & S1CTran) == 0; |
| // Work out if we should skip the first stage of translation and go |
| // directly to stage 2. This value is cached so we don't have to |
| // compute it for every translation. |
| stage2Req = isStage2 || |
| (hcr.vm && !isHyp && !isSecure && |
| !(tranType & S1CTran) && (aarch64EL < EL2) && |
| !(tranType & S1E1Tran)); // <--- FIX THIS HACK |
| stage2DescReq = isStage2 || (hcr.vm && !isHyp && !isSecure && |
| (aarch64EL < EL2)); |
| directToStage2 = !isStage2 && stage2Req && !sctlr.m; |
| } else { |
| vmid = 0; |
| isHyp = false; |
| directToStage2 = false; |
| stage2Req = false; |
| stage2DescReq = false; |
| } |
| } else { // AArch32 |
| sctlr = tc->readMiscReg(snsBankedIndex(MISCREG_SCTLR, tc, |
| !isSecure)); |
| ttbcr = tc->readMiscReg(snsBankedIndex(MISCREG_TTBCR, tc, |
| !isSecure)); |
| scr = tc->readMiscReg(MISCREG_SCR); |
| isPriv = cpsr.mode != MODE_USER; |
| if (longDescFormatInUse(tc)) { |
| uint64_t ttbr_asid = tc->readMiscReg( |
| snsBankedIndex(ttbcr.a1 ? MISCREG_TTBR1 : |
| MISCREG_TTBR0, |
| tc, !isSecure)); |
| asid = bits(ttbr_asid, 55, 48); |
| } else { // Short-descriptor translation table format in use |
| CONTEXTIDR context_id = tc->readMiscReg(snsBankedIndex( |
| MISCREG_CONTEXTIDR, tc,!isSecure)); |
| asid = context_id.asid; |
| } |
| prrr = tc->readMiscReg(snsBankedIndex(MISCREG_PRRR, tc, |
| !isSecure)); |
| nmrr = tc->readMiscReg(snsBankedIndex(MISCREG_NMRR, tc, |
| !isSecure)); |
| dacr = tc->readMiscReg(snsBankedIndex(MISCREG_DACR, tc, |
| !isSecure)); |
| hcr = tc->readMiscReg(MISCREG_HCR); |
| |
| if (haveVirtualization) { |
| vmid = bits(tc->readMiscReg(MISCREG_VTTBR), 55, 48); |
| isHyp = cpsr.mode == MODE_HYP; |
| isHyp |= tranType & HypMode; |
| isHyp &= (tranType & S1S2NsTran) == 0; |
| isHyp &= (tranType & S1CTran) == 0; |
| if (isHyp) { |
| sctlr = tc->readMiscReg(MISCREG_HSCTLR); |
| } |
| // Work out if we should skip the first stage of translation and go |
| // directly to stage 2. This value is cached so we don't have to |
| // compute it for every translation. |
| stage2Req = hcr.vm && !isStage2 && !isHyp && !isSecure && |
| !(tranType & S1CTran); |
| stage2DescReq = hcr.vm && !isStage2 && !isHyp && !isSecure; |
| directToStage2 = stage2Req && !sctlr.m; |
| } else { |
| vmid = 0; |
| stage2Req = false; |
| isHyp = false; |
| directToStage2 = false; |
| stage2DescReq = false; |
| } |
| } |
| miscRegValid = true; |
| miscRegContext = tc->contextId(); |
| curTranType = tranType; |
| } |
| |
| ExceptionLevel |
| TLB::tranTypeEL(CPSR cpsr, ArmTranslationType type) |
| { |
| switch (type) { |
| case S1E0Tran: |
| case S12E0Tran: |
| return EL0; |
| |
| case S1E1Tran: |
| case S12E1Tran: |
| return EL1; |
| |
| case S1E2Tran: |
| return EL2; |
| |
| case S1E3Tran: |
| return EL3; |
| |
| case NormalTran: |
| case S1CTran: |
| case S1S2NsTran: |
| case HypMode: |
| return currEL(cpsr); |
| |
| default: |
| panic("Unknown translation mode!\n"); |
| } |
| } |
| |
| Fault |
| TLB::getTE(TlbEntry **te, const RequestPtr &req, ThreadContext *tc, Mode mode, |
| Translation *translation, bool timing, bool functional, |
| bool is_secure, TLB::ArmTranslationType tranType) |
| { |
| // In a 2-stage system, the IPA->PA translation can be started via this |
| // call so make sure the miscRegs are correct. |
| if (isStage2) { |
| updateMiscReg(tc, tranType); |
| } |
| bool is_fetch = (mode == Execute); |
| bool is_write = (mode == Write); |
| |
| Addr vaddr_tainted = req->getVaddr(); |
| Addr vaddr = 0; |
| ExceptionLevel target_el = aarch64 ? aarch64EL : EL1; |
| if (aarch64) { |
| vaddr = purifyTaggedAddr(vaddr_tainted, tc, target_el, (TCR)ttbcr, |
| mode==Execute); |
| } else { |
| vaddr = vaddr_tainted; |
| } |
| *te = lookup(vaddr, asid, vmid, isHyp, is_secure, false, false, target_el); |
| if (*te == NULL) { |
| if (req->isPrefetch()) { |
| // if the request is a prefetch don't attempt to fill the TLB or go |
| // any further with the memory access (here we can safely use the |
| // fault status for the short desc. format in all cases) |
| prefetchFaults++; |
| return std::make_shared<PrefetchAbort>( |
| vaddr_tainted, ArmFault::PrefetchTLBMiss, isStage2); |
| } |
| |
| if (is_fetch) |
| instMisses++; |
| else if (is_write) |
| writeMisses++; |
| else |
| readMisses++; |
| |
| // start translation table walk, pass variables rather than |
| // re-retreaving in table walker for speed |
| DPRINTF(TLB, "TLB Miss: Starting hardware table walker for %#x(%d:%d)\n", |
| vaddr_tainted, asid, vmid); |
| Fault fault; |
| fault = tableWalker->walk(req, tc, asid, vmid, isHyp, mode, |
| translation, timing, functional, is_secure, |
| tranType, stage2DescReq); |
| // for timing mode, return and wait for table walk, |
| if (timing || fault != NoFault) { |
| return fault; |
| } |
| |
| *te = lookup(vaddr, asid, vmid, isHyp, is_secure, false, false, target_el); |
| if (!*te) |
| printTlb(); |
| assert(*te); |
| } else { |
| if (is_fetch) |
| instHits++; |
| else if (is_write) |
| writeHits++; |
| else |
| readHits++; |
| } |
| return NoFault; |
| } |
| |
| Fault |
| TLB::getResultTe(TlbEntry **te, const RequestPtr &req, |
| ThreadContext *tc, Mode mode, |
| Translation *translation, bool timing, bool functional, |
| TlbEntry *mergeTe) |
| { |
| Fault fault; |
| |
| if (isStage2) { |
| // We are already in the stage 2 TLB. Grab the table entry for stage |
| // 2 only. We are here because stage 1 translation is disabled. |
| TlbEntry *s2Te = NULL; |
| // Get the stage 2 table entry |
| fault = getTE(&s2Te, req, tc, mode, translation, timing, functional, |
| isSecure, curTranType); |
| // Check permissions of stage 2 |
| if ((s2Te != NULL) && (fault == NoFault)) { |
| if (aarch64) |
| fault = checkPermissions64(s2Te, req, mode, tc); |
| else |
| fault = checkPermissions(s2Te, req, mode); |
| } |
| *te = s2Te; |
| return fault; |
| } |
| |
| TlbEntry *s1Te = NULL; |
| |
| Addr vaddr_tainted = req->getVaddr(); |
| |
| // Get the stage 1 table entry |
| fault = getTE(&s1Te, req, tc, mode, translation, timing, functional, |
| isSecure, curTranType); |
| // only proceed if we have a valid table entry |
| if ((s1Te != NULL) && (fault == NoFault)) { |
| // Check stage 1 permissions before checking stage 2 |
| if (aarch64) |
| fault = checkPermissions64(s1Te, req, mode, tc); |
| else |
| fault = checkPermissions(s1Te, req, mode); |
| if (stage2Req & (fault == NoFault)) { |
| Stage2LookUp *s2Lookup = new Stage2LookUp(this, stage2Tlb, *s1Te, |
| req, translation, mode, timing, functional, curTranType); |
| fault = s2Lookup->getTe(tc, mergeTe); |
| if (s2Lookup->isComplete()) { |
| *te = mergeTe; |
| // We've finished with the lookup so delete it |
| delete s2Lookup; |
| } else { |
| // The lookup hasn't completed, so we can't delete it now. We |
| // get round this by asking the object to self delete when the |
| // translation is complete. |
| s2Lookup->setSelfDelete(); |
| } |
| } else { |
| // This case deals with an S1 hit (or bypass), followed by |
| // an S2 hit-but-perms issue |
| if (isStage2) { |
| DPRINTF(TLBVerbose, "s2TLB: reqVa %#x, reqPa %#x, fault %p\n", |
| vaddr_tainted, req->hasPaddr() ? req->getPaddr() : ~0, fault); |
| if (fault != NoFault) { |
| ArmFault *armFault = reinterpret_cast<ArmFault *>(fault.get()); |
| armFault->annotate(ArmFault::S1PTW, false); |
| armFault->annotate(ArmFault::OVA, vaddr_tainted); |
| } |
| } |
| *te = s1Te; |
| } |
| } |
| return fault; |
| } |
| |
| void |
| TLB::setTestInterface(SimObject *_ti) |
| { |
| if (!_ti) { |
| test = nullptr; |
| } else { |
| TlbTestInterface *ti(dynamic_cast<TlbTestInterface *>(_ti)); |
| fatal_if(!ti, "%s is not a valid ARM TLB tester\n", _ti->name()); |
| test = ti; |
| } |
| } |
| |
| Fault |
| TLB::testTranslation(const RequestPtr &req, Mode mode, |
| TlbEntry::DomainType domain) |
| { |
| if (!test || !req->hasSize() || req->getSize() == 0 || |
| req->isCacheMaintenance()) { |
| return NoFault; |
| } else { |
| return test->translationCheck(req, isPriv, mode, domain); |
| } |
| } |
| |
| Fault |
| TLB::testWalk(Addr pa, Addr size, Addr va, bool is_secure, Mode mode, |
| TlbEntry::DomainType domain, LookupLevel lookup_level) |
| { |
| if (!test) { |
| return NoFault; |
| } else { |
| return test->walkCheck(pa, size, va, is_secure, isPriv, mode, |
| domain, lookup_level); |
| } |
| } |
| |
| |
| ArmISA::TLB * |
| ArmTLBParams::create() |
| { |
| return new ArmISA::TLB(this); |
| } |
