636 lines
18 KiB
C++
636 lines
18 KiB
C++
/*
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* Copyright (c) 2001-2005 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Nathan Binkert
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* Steve Reinhardt
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* Andrew Schultz
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*/
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#include <string>
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#include <vector>
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#include "arch/alpha/pagetable.hh"
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#include "arch/alpha/tlb.hh"
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#include "arch/alpha/faults.hh"
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#include "base/inifile.hh"
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#include "base/str.hh"
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#include "base/trace.hh"
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#include "config/alpha_tlaser.hh"
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#include "cpu/thread_context.hh"
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#include "sim/builder.hh"
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using namespace std;
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using namespace EV5;
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namespace AlphaISA
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{
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///////////////////////////////////////////////////////////////////////
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//
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// Alpha TLB
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//
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#ifdef DEBUG
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bool uncacheBit39 = false;
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bool uncacheBit40 = false;
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#endif
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#define MODE2MASK(X) (1 << (X))
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TLB::TLB(const string &name, int s)
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: SimObject(name), size(s), nlu(0)
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{
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table = new PTE[size];
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memset(table, 0, sizeof(PTE[size]));
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}
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TLB::~TLB()
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{
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if (table)
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delete [] table;
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}
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// look up an entry in the TLB
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PTE *
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TLB::lookup(Addr vpn, uint8_t asn) const
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{
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// assume not found...
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PTE *retval = NULL;
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PageTable::const_iterator i = lookupTable.find(vpn);
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if (i != lookupTable.end()) {
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while (i->first == vpn) {
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int index = i->second;
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PTE *pte = &table[index];
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assert(pte->valid);
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if (vpn == pte->tag && (pte->asma || pte->asn == asn)) {
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retval = pte;
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break;
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}
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++i;
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}
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}
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DPRINTF(TLB, "lookup %#x, asn %#x -> %s ppn %#x\n", vpn, (int)asn,
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retval ? "hit" : "miss", retval ? retval->ppn : 0);
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return retval;
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}
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Fault
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TLB::checkCacheability(RequestPtr &req)
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{
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// in Alpha, cacheability is controlled by upper-level bits of the
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// physical address
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/*
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* We support having the uncacheable bit in either bit 39 or bit 40.
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* The Turbolaser platform (and EV5) support having the bit in 39, but
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* Tsunami (which Linux assumes uses an EV6) generates accesses with
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* the bit in 40. So we must check for both, but we have debug flags
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* to catch a weird case where both are used, which shouldn't happen.
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*/
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#if ALPHA_TLASER
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if (req->getPaddr() & PAddrUncachedBit39) {
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#else
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if (req->getPaddr() & PAddrUncachedBit43) {
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#endif
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// IPR memory space not implemented
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if (PAddrIprSpace(req->getPaddr())) {
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return new UnimpFault("IPR memory space not implemented!");
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} else {
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// mark request as uncacheable
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req->setFlags(req->getFlags() | UNCACHEABLE);
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#if !ALPHA_TLASER
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// Clear bits 42:35 of the physical address (10-2 in Tsunami manual)
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req->setPaddr(req->getPaddr() & PAddrUncachedMask);
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#endif
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}
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}
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return NoFault;
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}
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// insert a new TLB entry
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void
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TLB::insert(Addr addr, PTE &pte)
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{
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VAddr vaddr = addr;
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if (table[nlu].valid) {
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Addr oldvpn = table[nlu].tag;
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PageTable::iterator i = lookupTable.find(oldvpn);
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if (i == lookupTable.end())
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panic("TLB entry not found in lookupTable");
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int index;
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while ((index = i->second) != nlu) {
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if (table[index].tag != oldvpn)
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panic("TLB entry not found in lookupTable");
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++i;
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}
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DPRINTF(TLB, "remove @%d: %#x -> %#x\n", nlu, oldvpn, table[nlu].ppn);
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lookupTable.erase(i);
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}
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DPRINTF(TLB, "insert @%d: %#x -> %#x\n", nlu, vaddr.vpn(), pte.ppn);
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table[nlu] = pte;
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table[nlu].tag = vaddr.vpn();
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table[nlu].valid = true;
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lookupTable.insert(make_pair(vaddr.vpn(), nlu));
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nextnlu();
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}
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void
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TLB::flushAll()
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{
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DPRINTF(TLB, "flushAll\n");
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memset(table, 0, sizeof(PTE[size]));
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lookupTable.clear();
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nlu = 0;
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}
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void
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TLB::flushProcesses()
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{
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PageTable::iterator i = lookupTable.begin();
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PageTable::iterator end = lookupTable.end();
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while (i != end) {
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int index = i->second;
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PTE *pte = &table[index];
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assert(pte->valid);
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// we can't increment i after we erase it, so save a copy and
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// increment it to get the next entry now
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PageTable::iterator cur = i;
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++i;
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if (!pte->asma) {
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DPRINTF(TLB, "flush @%d: %#x -> %#x\n", index, pte->tag, pte->ppn);
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pte->valid = false;
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lookupTable.erase(cur);
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}
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}
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}
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void
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TLB::flushAddr(Addr addr, uint8_t asn)
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{
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VAddr vaddr = addr;
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PageTable::iterator i = lookupTable.find(vaddr.vpn());
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if (i == lookupTable.end())
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return;
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while (i->first == vaddr.vpn()) {
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int index = i->second;
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PTE *pte = &table[index];
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assert(pte->valid);
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if (vaddr.vpn() == pte->tag && (pte->asma || pte->asn == asn)) {
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DPRINTF(TLB, "flushaddr @%d: %#x -> %#x\n", index, vaddr.vpn(),
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pte->ppn);
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// invalidate this entry
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pte->valid = false;
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lookupTable.erase(i);
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}
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++i;
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}
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}
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void
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TLB::serialize(ostream &os)
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{
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SERIALIZE_SCALAR(size);
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SERIALIZE_SCALAR(nlu);
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for (int i = 0; i < size; i++) {
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nameOut(os, csprintf("%s.PTE%d", name(), i));
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table[i].serialize(os);
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}
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}
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void
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TLB::unserialize(Checkpoint *cp, const string §ion)
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{
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UNSERIALIZE_SCALAR(size);
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UNSERIALIZE_SCALAR(nlu);
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for (int i = 0; i < size; i++) {
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table[i].unserialize(cp, csprintf("%s.PTE%d", section, i));
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if (table[i].valid) {
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lookupTable.insert(make_pair(table[i].tag, i));
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}
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}
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}
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///////////////////////////////////////////////////////////////////////
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//
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// Alpha ITB
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//
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ITB::ITB(const std::string &name, int size)
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: TLB(name, size)
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{}
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void
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ITB::regStats()
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{
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hits
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.name(name() + ".hits")
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.desc("ITB hits");
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misses
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.name(name() + ".misses")
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.desc("ITB misses");
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acv
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.name(name() + ".acv")
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.desc("ITB acv");
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accesses
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.name(name() + ".accesses")
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.desc("ITB accesses");
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accesses = hits + misses;
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}
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Fault
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ITB::translate(RequestPtr &req, ThreadContext *tc) const
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{
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if (PcPAL(req->getVaddr())) {
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// strip off PAL PC marker (lsb is 1)
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req->setPaddr((req->getVaddr() & ~3) & PAddrImplMask);
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hits++;
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return NoFault;
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}
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if (req->getFlags() & PHYSICAL) {
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req->setPaddr(req->getVaddr());
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} else {
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// verify that this is a good virtual address
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if (!validVirtualAddress(req->getVaddr())) {
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acv++;
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return new ItbAcvFault(req->getVaddr());
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}
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// VA<42:41> == 2, VA<39:13> maps directly to PA<39:13> for EV5
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// VA<47:41> == 0x7e, VA<40:13> maps directly to PA<40:13> for EV6
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#if ALPHA_TLASER
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if ((MCSR_SP(tc->readMiscReg(IPR_MCSR)) & 2) &&
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VAddrSpaceEV5(req->getVaddr()) == 2) {
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#else
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if (VAddrSpaceEV6(req->getVaddr()) == 0x7e) {
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#endif
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// only valid in kernel mode
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if (ICM_CM(tc->readMiscReg(IPR_ICM)) !=
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mode_kernel) {
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acv++;
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return new ItbAcvFault(req->getVaddr());
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}
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req->setPaddr(req->getVaddr() & PAddrImplMask);
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#if !ALPHA_TLASER
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// sign extend the physical address properly
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if (req->getPaddr() & PAddrUncachedBit40)
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req->setPaddr(req->getPaddr() | ULL(0xf0000000000));
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else
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req->setPaddr(req->getPaddr() & ULL(0xffffffffff));
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#endif
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} else {
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// not a physical address: need to look up pte
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int asn = DTB_ASN_ASN(tc->readMiscReg(IPR_DTB_ASN));
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PTE *pte = lookup(VAddr(req->getVaddr()).vpn(),
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asn);
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if (!pte) {
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misses++;
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return new ItbPageFault(req->getVaddr());
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}
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req->setPaddr((pte->ppn << PageShift) +
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(VAddr(req->getVaddr()).offset()
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& ~3));
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// check permissions for this access
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if (!(pte->xre &
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(1 << ICM_CM(tc->readMiscReg(IPR_ICM))))) {
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// instruction access fault
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acv++;
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return new ItbAcvFault(req->getVaddr());
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}
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hits++;
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}
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}
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// check that the physical address is ok (catch bad physical addresses)
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if (req->getPaddr() & ~PAddrImplMask)
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return genMachineCheckFault();
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return checkCacheability(req);
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}
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///////////////////////////////////////////////////////////////////////
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//
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// Alpha DTB
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//
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DTB::DTB(const std::string &name, int size)
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: TLB(name, size)
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{}
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void
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DTB::regStats()
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{
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read_hits
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.name(name() + ".read_hits")
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.desc("DTB read hits")
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;
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read_misses
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.name(name() + ".read_misses")
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.desc("DTB read misses")
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;
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read_acv
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.name(name() + ".read_acv")
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.desc("DTB read access violations")
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;
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read_accesses
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.name(name() + ".read_accesses")
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.desc("DTB read accesses")
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;
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write_hits
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.name(name() + ".write_hits")
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.desc("DTB write hits")
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;
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write_misses
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.name(name() + ".write_misses")
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.desc("DTB write misses")
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;
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write_acv
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.name(name() + ".write_acv")
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.desc("DTB write access violations")
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;
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write_accesses
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.name(name() + ".write_accesses")
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.desc("DTB write accesses")
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;
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hits
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.name(name() + ".hits")
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.desc("DTB hits")
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;
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misses
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.name(name() + ".misses")
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.desc("DTB misses")
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;
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acv
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.name(name() + ".acv")
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.desc("DTB access violations")
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;
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accesses
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.name(name() + ".accesses")
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.desc("DTB accesses")
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;
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hits = read_hits + write_hits;
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misses = read_misses + write_misses;
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acv = read_acv + write_acv;
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accesses = read_accesses + write_accesses;
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}
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Fault
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DTB::translate(RequestPtr &req, ThreadContext *tc, bool write) const
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{
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Addr pc = tc->readPC();
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mode_type mode =
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(mode_type)DTB_CM_CM(tc->readMiscReg(IPR_DTB_CM));
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/**
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* Check for alignment faults
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*/
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if (req->getVaddr() & (req->getSize() - 1)) {
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DPRINTF(TLB, "Alignment Fault on %#x, size = %d", req->getVaddr(),
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req->getSize());
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uint64_t flags = write ? MM_STAT_WR_MASK : 0;
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return new DtbAlignmentFault(req->getVaddr(), req->getFlags(), flags);
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}
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if (pc & 0x1) {
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mode = (req->getFlags() & ALTMODE) ?
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(mode_type)ALT_MODE_AM(
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tc->readMiscReg(IPR_ALT_MODE))
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: mode_kernel;
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}
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if (req->getFlags() & PHYSICAL) {
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req->setPaddr(req->getVaddr());
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} else {
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// verify that this is a good virtual address
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if (!validVirtualAddress(req->getVaddr())) {
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if (write) { write_acv++; } else { read_acv++; }
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uint64_t flags = (write ? MM_STAT_WR_MASK : 0) |
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MM_STAT_BAD_VA_MASK |
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MM_STAT_ACV_MASK;
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return new DtbPageFault(req->getVaddr(), req->getFlags(), flags);
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}
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// Check for "superpage" mapping
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#if ALPHA_TLASER
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if ((MCSR_SP(tc->readMiscReg(IPR_MCSR)) & 2) &&
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VAddrSpaceEV5(req->getVaddr()) == 2) {
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#else
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if (VAddrSpaceEV6(req->getVaddr()) == 0x7e) {
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#endif
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// only valid in kernel mode
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if (DTB_CM_CM(tc->readMiscReg(IPR_DTB_CM)) !=
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mode_kernel) {
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if (write) { write_acv++; } else { read_acv++; }
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uint64_t flags = ((write ? MM_STAT_WR_MASK : 0) |
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MM_STAT_ACV_MASK);
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return new DtbAcvFault(req->getVaddr(), req->getFlags(), flags);
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}
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req->setPaddr(req->getVaddr() & PAddrImplMask);
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#if !ALPHA_TLASER
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// sign extend the physical address properly
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if (req->getPaddr() & PAddrUncachedBit40)
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req->setPaddr(req->getPaddr() | ULL(0xf0000000000));
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else
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req->setPaddr(req->getPaddr() & ULL(0xffffffffff));
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#endif
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} else {
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if (write)
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write_accesses++;
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else
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read_accesses++;
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int asn = DTB_ASN_ASN(tc->readMiscReg(IPR_DTB_ASN));
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// not a physical address: need to look up pte
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PTE *pte = lookup(VAddr(req->getVaddr()).vpn(),
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asn);
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if (!pte) {
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// page fault
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if (write) { write_misses++; } else { read_misses++; }
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uint64_t flags = (write ? MM_STAT_WR_MASK : 0) |
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MM_STAT_DTB_MISS_MASK;
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return (req->getFlags() & VPTE) ?
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(Fault)(new PDtbMissFault(req->getVaddr(), req->getFlags(),
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flags)) :
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(Fault)(new NDtbMissFault(req->getVaddr(), req->getFlags(),
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flags));
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}
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req->setPaddr((pte->ppn << PageShift) +
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VAddr(req->getVaddr()).offset());
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if (write) {
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if (!(pte->xwe & MODE2MASK(mode))) {
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// declare the instruction access fault
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write_acv++;
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uint64_t flags = MM_STAT_WR_MASK |
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MM_STAT_ACV_MASK |
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(pte->fonw ? MM_STAT_FONW_MASK : 0);
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return new DtbPageFault(req->getVaddr(), req->getFlags(), flags);
|
|
}
|
|
if (pte->fonw) {
|
|
write_acv++;
|
|
uint64_t flags = MM_STAT_WR_MASK |
|
|
MM_STAT_FONW_MASK;
|
|
return new DtbPageFault(req->getVaddr(), req->getFlags(), flags);
|
|
}
|
|
} else {
|
|
if (!(pte->xre & MODE2MASK(mode))) {
|
|
read_acv++;
|
|
uint64_t flags = MM_STAT_ACV_MASK |
|
|
(pte->fonr ? MM_STAT_FONR_MASK : 0);
|
|
return new DtbAcvFault(req->getVaddr(), req->getFlags(), flags);
|
|
}
|
|
if (pte->fonr) {
|
|
read_acv++;
|
|
uint64_t flags = MM_STAT_FONR_MASK;
|
|
return new DtbPageFault(req->getVaddr(), req->getFlags(), flags);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (write)
|
|
write_hits++;
|
|
else
|
|
read_hits++;
|
|
}
|
|
|
|
// check that the physical address is ok (catch bad physical addresses)
|
|
if (req->getPaddr() & ~PAddrImplMask)
|
|
return genMachineCheckFault();
|
|
|
|
return checkCacheability(req);
|
|
}
|
|
|
|
PTE &
|
|
TLB::index(bool advance)
|
|
{
|
|
PTE *pte = &table[nlu];
|
|
|
|
if (advance)
|
|
nextnlu();
|
|
|
|
return *pte;
|
|
}
|
|
|
|
DEFINE_SIM_OBJECT_CLASS_NAME("AlphaTLB", TLB)
|
|
|
|
BEGIN_DECLARE_SIM_OBJECT_PARAMS(ITB)
|
|
|
|
Param<int> size;
|
|
|
|
END_DECLARE_SIM_OBJECT_PARAMS(ITB)
|
|
|
|
BEGIN_INIT_SIM_OBJECT_PARAMS(ITB)
|
|
|
|
INIT_PARAM_DFLT(size, "TLB size", 48)
|
|
|
|
END_INIT_SIM_OBJECT_PARAMS(ITB)
|
|
|
|
|
|
CREATE_SIM_OBJECT(ITB)
|
|
{
|
|
return new ITB(getInstanceName(), size);
|
|
}
|
|
|
|
REGISTER_SIM_OBJECT("AlphaITB", ITB)
|
|
|
|
BEGIN_DECLARE_SIM_OBJECT_PARAMS(DTB)
|
|
|
|
Param<int> size;
|
|
|
|
END_DECLARE_SIM_OBJECT_PARAMS(DTB)
|
|
|
|
BEGIN_INIT_SIM_OBJECT_PARAMS(DTB)
|
|
|
|
INIT_PARAM_DFLT(size, "TLB size", 64)
|
|
|
|
END_INIT_SIM_OBJECT_PARAMS(DTB)
|
|
|
|
|
|
CREATE_SIM_OBJECT(DTB)
|
|
{
|
|
return new DTB(getInstanceName(), size);
|
|
}
|
|
|
|
REGISTER_SIM_OBJECT("AlphaDTB", DTB)
|
|
}
|