* Copyright (c) 2007-2008 The Hewlett-Packard Development Company
* All rights reserved.
*
- * Redistribution and use of this software in source and binary forms,
- * with or without modification, are permitted provided that the
- * following conditions are met:
+ * 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.
*
- * The software must be used only for Non-Commercial Use which means any
- * use which is NOT directed to receiving any direct monetary
- * compensation for, or commercial advantage from such use. Illustrative
- * examples of non-commercial use are academic research, personal study,
- * teaching, education and corporate research & development.
- * Illustrative examples of commercial use are distributing products for
- * commercial advantage and providing services using the software for
- * commercial advantage.
- *
- * If you wish to use this software or functionality therein that may be
- * covered by patents for commercial use, please contact:
- * Director of Intellectual Property Licensing
- * Office of Strategy and Technology
- * Hewlett-Packard Company
- * 1501 Page Mill Road
- * Palo Alto, California 94304
- *
- * 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 HOLDER(s), HEWLETT-PACKARD COMPANY, nor the names of its
+ * 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. No right of
- * sublicense is granted herewith. Derivatives of the software and
- * output created using the software may be prepared, but only for
- * Non-Commercial Uses. Derivatives of the software may be shared with
- * others provided: (i) the others agree to abide by the list of
- * conditions herein which includes the Non-Commercial Use restrictions;
- * and (ii) such Derivatives of the software include the above copyright
- * notice to acknowledge the contribution from this software where
- * applicable, this list of conditions and the disclaimer below.
+ * 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
*/
#include <cstring>
+#include <memory>
-#include "config/full_system.hh"
-
+#include "arch/generic/mmapped_ipr.hh"
+#include "arch/x86/insts/microldstop.hh"
+#include "arch/x86/regs/misc.hh"
+#include "arch/x86/regs/msr.hh"
+#include "arch/x86/faults.hh"
#include "arch/x86/pagetable.hh"
+#include "arch/x86/pagetable_walker.hh"
#include "arch/x86/tlb.hh"
#include "arch/x86/x86_traits.hh"
#include "base/bitfield.hh"
#include "base/trace.hh"
-#include "config/full_system.hh"
-#include "cpu/thread_context.hh"
#include "cpu/base.hh"
+#include "cpu/thread_context.hh"
+#include "debug/TLB.hh"
#include "mem/packet_access.hh"
+#include "mem/page_table.hh"
#include "mem/request.hh"
-
-#if FULL_SYSTEM
-#include "arch/x86/pagetable_walker.hh"
-#endif
+#include "sim/full_system.hh"
+#include "sim/process.hh"
namespace X86ISA {
-TLB::TLB(const Params *p) : BaseTLB(p), configAddress(0), size(p->size)
+TLB::TLB(const Params *p) : BaseTLB(p), configAddress(0), size(p->size),
+ lruSeq(0)
{
+ if (!size)
+ fatal("TLBs must have a non-zero size.\n");
tlb = new TlbEntry[size];
std::memset(tlb, 0, sizeof(TlbEntry) * size);
- for (int x = 0; x < size; x++)
+ for (int x = 0; x < size; x++) {
+ tlb[x].trieHandle = NULL;
freeList.push_back(&tlb[x]);
+ }
-#if FULL_SYSTEM
walker = p->walker;
walker->setTLB(this);
-#endif
}
void
-TLB::insert(Addr vpn, TlbEntry &entry)
+TLB::evictLRU()
{
- //TODO Deal with conflicting entries
+ // Find the entry with the lowest (and hence least recently updated)
+ // sequence number.
- TlbEntry *newEntry = NULL;
- if (!freeList.empty()) {
- newEntry = freeList.front();
- freeList.pop_front();
- } else {
- newEntry = entryList.back();
- entryList.pop_back();
+ unsigned lru = 0;
+ for (unsigned i = 1; i < size; i++) {
+ if (tlb[i].lruSeq < tlb[lru].lruSeq)
+ lru = i;
}
- *newEntry = entry;
- newEntry->vaddr = vpn;
- entryList.push_front(newEntry);
+
+ assert(tlb[lru].trieHandle);
+ trie.remove(tlb[lru].trieHandle);
+ tlb[lru].trieHandle = NULL;
+ freeList.push_back(&tlb[lru]);
}
-TLB::EntryList::iterator
-TLB::lookupIt(Addr va, bool update_lru)
+TlbEntry *
+TLB::insert(Addr vpn, TlbEntry &entry)
{
- //TODO make this smarter at some point
- EntryList::iterator entry;
- for (entry = entryList.begin(); entry != entryList.end(); entry++) {
- if ((*entry)->vaddr <= va && (*entry)->vaddr + (*entry)->size > va) {
- DPRINTF(TLB, "Matched vaddr %#x to entry starting at %#x "
- "with size %#x.\n", va, (*entry)->vaddr, (*entry)->size);
- if (update_lru) {
- entryList.push_front(*entry);
- entryList.erase(entry);
- entry = entryList.begin();
- }
- break;
- }
+ // If somebody beat us to it, just use that existing entry.
+ TlbEntry *newEntry = trie.lookup(vpn);
+ if (newEntry) {
+ assert(newEntry->vaddr == vpn);
+ return newEntry;
}
- return entry;
+
+ if (freeList.empty())
+ evictLRU();
+
+ newEntry = freeList.front();
+ freeList.pop_front();
+
+ *newEntry = entry;
+ newEntry->lruSeq = nextSeq();
+ newEntry->vaddr = vpn;
+ newEntry->trieHandle =
+ trie.insert(vpn, TlbEntryTrie::MaxBits - entry.logBytes, newEntry);
+ return newEntry;
}
TlbEntry *
TLB::lookup(Addr va, bool update_lru)
{
- EntryList::iterator entry = lookupIt(va, update_lru);
- if (entry == entryList.end())
- return NULL;
- else
- return *entry;
-}
-
-#if FULL_SYSTEM
-void
-TLB::walk(ThreadContext * _tc, Addr vaddr)
-{
- walker->start(_tc, vaddr);
+ TlbEntry *entry = trie.lookup(va);
+ if (entry && update_lru)
+ entry->lruSeq = nextSeq();
+ return entry;
}
-#endif
void
-TLB::invalidateAll()
+TLB::flushAll()
{
DPRINTF(TLB, "Invalidating all entries.\n");
- while (!entryList.empty()) {
- TlbEntry *entry = entryList.front();
- entryList.pop_front();
- freeList.push_back(entry);
+ for (unsigned i = 0; i < size; i++) {
+ if (tlb[i].trieHandle) {
+ trie.remove(tlb[i].trieHandle);
+ tlb[i].trieHandle = NULL;
+ freeList.push_back(&tlb[i]);
+ }
}
}
}
void
-TLB::invalidateNonGlobal()
+TLB::flushNonGlobal()
{
DPRINTF(TLB, "Invalidating all non global entries.\n");
- EntryList::iterator entryIt;
- for (entryIt = entryList.begin(); entryIt != entryList.end();) {
- if (!(*entryIt)->global) {
- freeList.push_back(*entryIt);
- entryList.erase(entryIt++);
- } else {
- entryIt++;
+ for (unsigned i = 0; i < size; i++) {
+ if (tlb[i].trieHandle && !tlb[i].global) {
+ trie.remove(tlb[i].trieHandle);
+ tlb[i].trieHandle = NULL;
+ freeList.push_back(&tlb[i]);
}
}
}
void
TLB::demapPage(Addr va, uint64_t asn)
{
- EntryList::iterator entry = lookupIt(va, false);
- if (entry != entryList.end()) {
- freeList.push_back(*entry);
- entryList.erase(entry);
+ TlbEntry *entry = trie.lookup(va);
+ if (entry) {
+ trie.remove(entry->trieHandle);
+ entry->trieHandle = NULL;
+ freeList.push_back(entry);
}
}
-template<class TlbFault>
Fault
-TLB::translate(RequestPtr &req, ThreadContext *tc, bool write, bool execute)
+TLB::translateInt(RequestPtr req, ThreadContext *tc)
{
+ DPRINTF(TLB, "Addresses references internal memory.\n");
Addr vaddr = req->getVaddr();
- DPRINTF(TLB, "Translating vaddr %#x.\n", vaddr);
- uint32_t flags = req->getFlags();
- bool storeCheck = flags & StoreCheck;
-
- int seg = flags & mask(4);
-
- //XXX Junk code to surpress the warning
- if (storeCheck);
-
- // If this is true, we're dealing with a request to read an internal
- // value.
- if (seg == SEGMENT_REG_MS) {
- DPRINTF(TLB, "Addresses references internal memory.\n");
- Addr prefix = (vaddr >> 3) & IntAddrPrefixMask;
- if (prefix == IntAddrPrefixCPUID) {
- panic("CPUID memory space not yet implemented!\n");
- } else if (prefix == IntAddrPrefixMSR) {
- vaddr = vaddr >> 3;
- req->setMmapedIpr(true);
- Addr regNum = 0;
- switch (vaddr & ~IntAddrPrefixMask) {
- case 0x10:
- regNum = MISCREG_TSC;
- break;
- case 0x1B:
- regNum = MISCREG_APIC_BASE;
- break;
- case 0xFE:
- regNum = MISCREG_MTRRCAP;
- break;
- case 0x174:
- regNum = MISCREG_SYSENTER_CS;
- break;
- case 0x175:
- regNum = MISCREG_SYSENTER_ESP;
- break;
- case 0x176:
- regNum = MISCREG_SYSENTER_EIP;
- break;
- case 0x179:
- regNum = MISCREG_MCG_CAP;
- break;
- case 0x17A:
- regNum = MISCREG_MCG_STATUS;
- break;
- case 0x17B:
- regNum = MISCREG_MCG_CTL;
- break;
- case 0x1D9:
- regNum = MISCREG_DEBUG_CTL_MSR;
- break;
- case 0x1DB:
- regNum = MISCREG_LAST_BRANCH_FROM_IP;
- break;
- case 0x1DC:
- regNum = MISCREG_LAST_BRANCH_TO_IP;
- break;
- case 0x1DD:
- regNum = MISCREG_LAST_EXCEPTION_FROM_IP;
- break;
- case 0x1DE:
- regNum = MISCREG_LAST_EXCEPTION_TO_IP;
- break;
- case 0x200:
- regNum = MISCREG_MTRR_PHYS_BASE_0;
- break;
- case 0x201:
- regNum = MISCREG_MTRR_PHYS_MASK_0;
- break;
- case 0x202:
- regNum = MISCREG_MTRR_PHYS_BASE_1;
- break;
- case 0x203:
- regNum = MISCREG_MTRR_PHYS_MASK_1;
- break;
- case 0x204:
- regNum = MISCREG_MTRR_PHYS_BASE_2;
- break;
- case 0x205:
- regNum = MISCREG_MTRR_PHYS_MASK_2;
- break;
- case 0x206:
- regNum = MISCREG_MTRR_PHYS_BASE_3;
- break;
- case 0x207:
- regNum = MISCREG_MTRR_PHYS_MASK_3;
- break;
- case 0x208:
- regNum = MISCREG_MTRR_PHYS_BASE_4;
- break;
- case 0x209:
- regNum = MISCREG_MTRR_PHYS_MASK_4;
- break;
- case 0x20A:
- regNum = MISCREG_MTRR_PHYS_BASE_5;
- break;
- case 0x20B:
- regNum = MISCREG_MTRR_PHYS_MASK_5;
- break;
- case 0x20C:
- regNum = MISCREG_MTRR_PHYS_BASE_6;
- break;
- case 0x20D:
- regNum = MISCREG_MTRR_PHYS_MASK_6;
- break;
- case 0x20E:
- regNum = MISCREG_MTRR_PHYS_BASE_7;
- break;
- case 0x20F:
- regNum = MISCREG_MTRR_PHYS_MASK_7;
- break;
- case 0x250:
- regNum = MISCREG_MTRR_FIX_64K_00000;
- break;
- case 0x258:
- regNum = MISCREG_MTRR_FIX_16K_80000;
- break;
- case 0x259:
- regNum = MISCREG_MTRR_FIX_16K_A0000;
- break;
- case 0x268:
- regNum = MISCREG_MTRR_FIX_4K_C0000;
- break;
- case 0x269:
- regNum = MISCREG_MTRR_FIX_4K_C8000;
- break;
- case 0x26A:
- regNum = MISCREG_MTRR_FIX_4K_D0000;
- break;
- case 0x26B:
- regNum = MISCREG_MTRR_FIX_4K_D8000;
- break;
- case 0x26C:
- regNum = MISCREG_MTRR_FIX_4K_E0000;
- break;
- case 0x26D:
- regNum = MISCREG_MTRR_FIX_4K_E8000;
- break;
- case 0x26E:
- regNum = MISCREG_MTRR_FIX_4K_F0000;
- break;
- case 0x26F:
- regNum = MISCREG_MTRR_FIX_4K_F8000;
- break;
- case 0x277:
- regNum = MISCREG_PAT;
- break;
- case 0x2FF:
- regNum = MISCREG_DEF_TYPE;
- break;
- case 0x400:
- regNum = MISCREG_MC0_CTL;
- break;
- case 0x404:
- regNum = MISCREG_MC1_CTL;
- break;
- case 0x408:
- regNum = MISCREG_MC2_CTL;
- break;
- case 0x40C:
- regNum = MISCREG_MC3_CTL;
- break;
- case 0x410:
- regNum = MISCREG_MC4_CTL;
- break;
- case 0x414:
- regNum = MISCREG_MC5_CTL;
- break;
- case 0x418:
- regNum = MISCREG_MC6_CTL;
- break;
- case 0x41C:
- regNum = MISCREG_MC7_CTL;
- break;
- case 0x401:
- regNum = MISCREG_MC0_STATUS;
- break;
- case 0x405:
- regNum = MISCREG_MC1_STATUS;
- break;
- case 0x409:
- regNum = MISCREG_MC2_STATUS;
- break;
- case 0x40D:
- regNum = MISCREG_MC3_STATUS;
- break;
- case 0x411:
- regNum = MISCREG_MC4_STATUS;
- break;
- case 0x415:
- regNum = MISCREG_MC5_STATUS;
- break;
- case 0x419:
- regNum = MISCREG_MC6_STATUS;
- break;
- case 0x41D:
- regNum = MISCREG_MC7_STATUS;
- break;
- case 0x402:
- regNum = MISCREG_MC0_ADDR;
- break;
- case 0x406:
- regNum = MISCREG_MC1_ADDR;
- break;
- case 0x40A:
- regNum = MISCREG_MC2_ADDR;
- break;
- case 0x40E:
- regNum = MISCREG_MC3_ADDR;
- break;
- case 0x412:
- regNum = MISCREG_MC4_ADDR;
- break;
- case 0x416:
- regNum = MISCREG_MC5_ADDR;
- break;
- case 0x41A:
- regNum = MISCREG_MC6_ADDR;
- break;
- case 0x41E:
- regNum = MISCREG_MC7_ADDR;
- break;
- case 0x403:
- regNum = MISCREG_MC0_MISC;
- break;
- case 0x407:
- regNum = MISCREG_MC1_MISC;
- break;
- case 0x40B:
- regNum = MISCREG_MC2_MISC;
- break;
- case 0x40F:
- regNum = MISCREG_MC3_MISC;
- break;
- case 0x413:
- regNum = MISCREG_MC4_MISC;
- break;
- case 0x417:
- regNum = MISCREG_MC5_MISC;
- break;
- case 0x41B:
- regNum = MISCREG_MC6_MISC;
- break;
- case 0x41F:
- regNum = MISCREG_MC7_MISC;
- break;
- case 0xC0000080:
- regNum = MISCREG_EFER;
- break;
- case 0xC0000081:
- regNum = MISCREG_STAR;
- break;
- case 0xC0000082:
- regNum = MISCREG_LSTAR;
- break;
- case 0xC0000083:
- regNum = MISCREG_CSTAR;
- break;
- case 0xC0000084:
- regNum = MISCREG_SF_MASK;
- break;
- case 0xC0000100:
- regNum = MISCREG_FS_BASE;
- break;
- case 0xC0000101:
- regNum = MISCREG_GS_BASE;
- break;
- case 0xC0000102:
- regNum = MISCREG_KERNEL_GS_BASE;
- break;
- case 0xC0000103:
- regNum = MISCREG_TSC_AUX;
- break;
- case 0xC0010000:
- regNum = MISCREG_PERF_EVT_SEL0;
- break;
- case 0xC0010001:
- regNum = MISCREG_PERF_EVT_SEL1;
- break;
- case 0xC0010002:
- regNum = MISCREG_PERF_EVT_SEL2;
- break;
- case 0xC0010003:
- regNum = MISCREG_PERF_EVT_SEL3;
- break;
- case 0xC0010004:
- regNum = MISCREG_PERF_EVT_CTR0;
- break;
- case 0xC0010005:
- regNum = MISCREG_PERF_EVT_CTR1;
- break;
- case 0xC0010006:
- regNum = MISCREG_PERF_EVT_CTR2;
- break;
- case 0xC0010007:
- regNum = MISCREG_PERF_EVT_CTR3;
- break;
- case 0xC0010010:
- regNum = MISCREG_SYSCFG;
- break;
- case 0xC0010016:
- regNum = MISCREG_IORR_BASE0;
- break;
- case 0xC0010017:
- regNum = MISCREG_IORR_BASE1;
- break;
- case 0xC0010018:
- regNum = MISCREG_IORR_MASK0;
- break;
- case 0xC0010019:
- regNum = MISCREG_IORR_MASK1;
- break;
- case 0xC001001A:
- regNum = MISCREG_TOP_MEM;
- break;
- case 0xC001001D:
- regNum = MISCREG_TOP_MEM2;
- break;
- case 0xC0010114:
- regNum = MISCREG_VM_CR;
- break;
- case 0xC0010115:
- regNum = MISCREG_IGNNE;
- break;
- case 0xC0010116:
- regNum = MISCREG_SMM_CTL;
- break;
- case 0xC0010117:
- regNum = MISCREG_VM_HSAVE_PA;
- break;
- default:
- return new GeneralProtection(0);
- }
- //The index is multiplied by the size of a MiscReg so that
- //any memory dependence calculations will not see these as
- //overlapping.
- req->setPaddr(regNum * sizeof(MiscReg));
- return NoFault;
- } else if (prefix == IntAddrPrefixIO) {
- // TODO If CPL > IOPL or in virtual mode, check the I/O permission
- // bitmap in the TSS.
-
- Addr IOPort = vaddr & ~IntAddrPrefixMask;
- // Make sure the address fits in the expected 16 bit IO address
- // space.
- assert(!(IOPort & ~0xFFFF));
- if (IOPort == 0xCF8 && req->getSize() == 4) {
- req->setMmapedIpr(true);
- req->setPaddr(MISCREG_PCI_CONFIG_ADDRESS * sizeof(MiscReg));
- } else if ((IOPort & ~mask(2)) == 0xCFC) {
- Addr configAddress =
- tc->readMiscRegNoEffect(MISCREG_PCI_CONFIG_ADDRESS);
- if (bits(configAddress, 31, 31)) {
- req->setPaddr(PhysAddrPrefixPciConfig |
- bits(configAddress, 30, 0));
- }
+ Addr prefix = (vaddr >> 3) & IntAddrPrefixMask;
+ if (prefix == IntAddrPrefixCPUID) {
+ panic("CPUID memory space not yet implemented!\n");
+ } else if (prefix == IntAddrPrefixMSR) {
+ vaddr = (vaddr >> 3) & ~IntAddrPrefixMask;
+ req->setFlags(Request::MMAPPED_IPR);
+
+ MiscRegIndex regNum;
+ if (!msrAddrToIndex(regNum, vaddr))
+ return std::make_shared<GeneralProtection>(0);
+
+ //The index is multiplied by the size of a MiscReg so that
+ //any memory dependence calculations will not see these as
+ //overlapping.
+ req->setPaddr((Addr)regNum * sizeof(MiscReg));
+ return NoFault;
+ } else if (prefix == IntAddrPrefixIO) {
+ // TODO If CPL > IOPL or in virtual mode, check the I/O permission
+ // bitmap in the TSS.
+
+ Addr IOPort = vaddr & ~IntAddrPrefixMask;
+ // Make sure the address fits in the expected 16 bit IO address
+ // space.
+ assert(!(IOPort & ~0xFFFF));
+ if (IOPort == 0xCF8 && req->getSize() == 4) {
+ req->setFlags(Request::MMAPPED_IPR);
+ req->setPaddr(MISCREG_PCI_CONFIG_ADDRESS * sizeof(MiscReg));
+ } else if ((IOPort & ~mask(2)) == 0xCFC) {
+ req->setFlags(Request::UNCACHEABLE);
+ Addr configAddress =
+ tc->readMiscRegNoEffect(MISCREG_PCI_CONFIG_ADDRESS);
+ if (bits(configAddress, 31, 31)) {
+ req->setPaddr(PhysAddrPrefixPciConfig |
+ mbits(configAddress, 30, 2) |
+ (IOPort & mask(2)));
} else {
req->setPaddr(PhysAddrPrefixIO | IOPort);
}
- return NoFault;
} else {
- panic("Access to unrecognized internal address space %#x.\n",
- prefix);
+ req->setFlags(Request::UNCACHEABLE);
+ req->setPaddr(PhysAddrPrefixIO | IOPort);
+ }
+ return NoFault;
+ } else {
+ panic("Access to unrecognized internal address space %#x.\n",
+ prefix);
+ }
+}
+
+Fault
+TLB::finalizePhysical(RequestPtr req, ThreadContext *tc, Mode mode) const
+{
+ Addr paddr = req->getPaddr();
+
+ AddrRange m5opRange(0xFFFF0000, 0xFFFFFFFF);
+
+ if (m5opRange.contains(paddr)) {
+ if (m5opRange.contains(paddr)) {
+ req->setFlags(Request::MMAPPED_IPR | Request::GENERIC_IPR);
+ req->setPaddr(GenericISA::iprAddressPseudoInst(
+ (paddr >> 8) & 0xFF,
+ paddr & 0xFF));
+ }
+ } else if (FullSystem) {
+ // Check for an access to the local APIC
+ LocalApicBase localApicBase =
+ tc->readMiscRegNoEffect(MISCREG_APIC_BASE);
+ AddrRange apicRange(localApicBase.base * PageBytes,
+ (localApicBase.base + 1) * PageBytes - 1);
+
+ if (apicRange.contains(paddr)) {
+ // The Intel developer's manuals say the below restrictions apply,
+ // but the linux kernel, because of a compiler optimization, breaks
+ // them.
+ /*
+ // Check alignment
+ if (paddr & ((32/8) - 1))
+ return new GeneralProtection(0);
+ // Check access size
+ if (req->getSize() != (32/8))
+ return new GeneralProtection(0);
+ */
+ // Force the access to be uncacheable.
+ req->setFlags(Request::UNCACHEABLE);
+ req->setPaddr(x86LocalAPICAddress(tc->contextId(),
+ paddr - apicRange.start()));
}
}
- // Get cr0. This will tell us how to do translation. We'll assume it was
- // verified to be correct and consistent when set.
- CR0 cr0 = tc->readMiscRegNoEffect(MISCREG_CR0);
+ return NoFault;
+}
+
+Fault
+TLB::translate(RequestPtr req, ThreadContext *tc, Translation *translation,
+ Mode mode, bool &delayedResponse, bool timing)
+{
+ uint32_t flags = req->getFlags();
+ int seg = flags & SegmentFlagMask;
+ bool storeCheck = flags & (StoreCheck << FlagShift);
+
+ delayedResponse = false;
+
+ // If this is true, we're dealing with a request to a non-memory address
+ // space.
+ if (seg == SEGMENT_REG_MS) {
+ return translateInt(req, tc);
+ }
+
+ Addr vaddr = req->getVaddr();
+ DPRINTF(TLB, "Translating vaddr %#x.\n", vaddr);
+
+ HandyM5Reg m5Reg = tc->readMiscRegNoEffect(MISCREG_M5_REG);
// If protected mode has been enabled...
- if (cr0.pe) {
+ if (m5Reg.prot) {
DPRINTF(TLB, "In protected mode.\n");
- Efer efer = tc->readMiscRegNoEffect(MISCREG_EFER);
- SegAttr csAttr = tc->readMiscRegNoEffect(MISCREG_CS_ATTR);
// If we're not in 64-bit mode, do protection/limit checks
- if (!efer.lma || !csAttr.longMode) {
+ if (m5Reg.mode != LongMode) {
DPRINTF(TLB, "Not in long mode. Checking segment protection.\n");
// Check for a NULL segment selector.
- if (!tc->readMiscRegNoEffect(MISCREG_SEG_SEL(seg)))
- return new GeneralProtection(0);
+ if (!(seg == SEGMENT_REG_TSG || seg == SYS_SEGMENT_REG_IDTR ||
+ seg == SEGMENT_REG_HS || seg == SEGMENT_REG_LS)
+ && !tc->readMiscRegNoEffect(MISCREG_SEG_SEL(seg)))
+ return std::make_shared<GeneralProtection>(0);
bool expandDown = false;
+ SegAttr attr = tc->readMiscRegNoEffect(MISCREG_SEG_ATTR(seg));
if (seg >= SEGMENT_REG_ES && seg <= SEGMENT_REG_HS) {
- SegAttr attr = tc->readMiscRegNoEffect(MISCREG_SEG_ATTR(seg));
- if (!attr.writable && write)
- return new GeneralProtection(0);
- if (!attr.readable && !write && !execute)
- return new GeneralProtection(0);
+ if (!attr.writable && (mode == Write || storeCheck))
+ return std::make_shared<GeneralProtection>(0);
+ if (!attr.readable && mode == Read)
+ return std::make_shared<GeneralProtection>(0);
expandDown = attr.expandDown;
+
}
Addr base = tc->readMiscRegNoEffect(MISCREG_SEG_BASE(seg));
Addr limit = tc->readMiscRegNoEffect(MISCREG_SEG_LIMIT(seg));
+ bool sizeOverride = (flags & (AddrSizeFlagBit << FlagShift));
+ unsigned logSize = sizeOverride ? (unsigned)m5Reg.altAddr
+ : (unsigned)m5Reg.defAddr;
+ int size = (1 << logSize) * 8;
+ Addr offset = bits(vaddr - base, size - 1, 0);
+ Addr endOffset = offset + req->getSize() - 1;
if (expandDown) {
DPRINTF(TLB, "Checking an expand down segment.\n");
- // We don't have to worry about the access going around the
- // end of memory because accesses will be broken up into
- // pieces at boundaries aligned on sizes smaller than an
- // entire address space. We do have to worry about the limit
- // being less than the base.
- if (limit < base) {
- if (limit < vaddr + req->getSize() && vaddr < base)
- return new GeneralProtection(0);
- } else {
- if (limit < vaddr + req->getSize())
- return new GeneralProtection(0);
- }
+ warn_once("Expand down segments are untested.\n");
+ if (offset <= limit || endOffset <= limit)
+ return std::make_shared<GeneralProtection>(0);
} else {
- if (limit < base) {
- if (vaddr <= limit || vaddr + req->getSize() >= base)
- return new GeneralProtection(0);
- } else {
- if (vaddr <= limit && vaddr + req->getSize() >= base)
- return new GeneralProtection(0);
- }
+ if (offset > limit || endOffset > limit)
+ return std::make_shared<GeneralProtection>(0);
}
}
+ if (m5Reg.submode != SixtyFourBitMode ||
+ (flags & (AddrSizeFlagBit << FlagShift)))
+ vaddr &= mask(32);
// If paging is enabled, do the translation.
- if (cr0.pg) {
+ if (m5Reg.paging) {
DPRINTF(TLB, "Paging enabled.\n");
// The vaddr already has the segment base applied.
TlbEntry *entry = lookup(vaddr);
if (!entry) {
- return new TlbFault(vaddr);
- } else {
- // Do paging protection checks.
- DPRINTF(TLB, "Entry found with paddr %#x, doing protection checks.\n", entry->paddr);
- Addr paddr = entry->paddr | (vaddr & (entry->size-1));
- DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, paddr);
- req->setPaddr(paddr);
+ if (FullSystem) {
+ Fault fault = walker->start(tc, translation, req, mode);
+ if (timing || fault != NoFault) {
+ // This gets ignored in atomic mode.
+ delayedResponse = true;
+ return fault;
+ }
+ entry = lookup(vaddr);
+ assert(entry);
+ } else {
+ DPRINTF(TLB, "Handling a TLB miss for "
+ "address %#x at pc %#x.\n",
+ vaddr, tc->instAddr());
+
+ Process *p = tc->getProcessPtr();
+ TlbEntry newEntry;
+ bool success = p->pTable->lookup(vaddr, newEntry);
+ if (!success && mode != Execute) {
+ // Check if we just need to grow the stack.
+ if (p->fixupStackFault(vaddr)) {
+ // If we did, lookup the entry for the new page.
+ success = p->pTable->lookup(vaddr, newEntry);
+ }
+ }
+ if (!success) {
+ return std::make_shared<PageFault>(vaddr, true, mode,
+ true, false);
+ } else {
+ Addr alignedVaddr = p->pTable->pageAlign(vaddr);
+ DPRINTF(TLB, "Mapping %#x to %#x\n", alignedVaddr,
+ newEntry.pageStart());
+ entry = insert(alignedVaddr, newEntry);
+ }
+ DPRINTF(TLB, "Miss was serviced.\n");
+ }
+ }
+
+ DPRINTF(TLB, "Entry found with paddr %#x, "
+ "doing protection checks.\n", entry->paddr);
+ // Do paging protection checks.
+ bool inUser = (m5Reg.cpl == 3 &&
+ !(flags & (CPL0FlagBit << FlagShift)));
+ CR0 cr0 = tc->readMiscRegNoEffect(MISCREG_CR0);
+ bool badWrite = (!entry->writable && (inUser || cr0.wp));
+ if ((inUser && !entry->user) || (mode == Write && badWrite)) {
+ // The page must have been present to get into the TLB in
+ // the first place. We'll assume the reserved bits are
+ // fine even though we're not checking them.
+ return std::make_shared<PageFault>(vaddr, true, mode, inUser,
+ false);
}
+ if (storeCheck && badWrite) {
+ // This would fault if this were a write, so return a page
+ // fault that reflects that happening.
+ return std::make_shared<PageFault>(vaddr, true, Write, inUser,
+ false);
+ }
+
+ Addr paddr = entry->paddr | (vaddr & mask(entry->logBytes));
+ DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, paddr);
+ req->setPaddr(paddr);
+ if (entry->uncacheable)
+ req->setFlags(Request::UNCACHEABLE);
} else {
//Use the address which already has segmentation applied.
DPRINTF(TLB, "Paging disabled.\n");
DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, vaddr);
req->setPaddr(vaddr);
}
- // Check for an access to the local APIC
-#if FULL_SYSTEM
- LocalApicBase localApicBase = tc->readMiscRegNoEffect(MISCREG_APIC_BASE);
- Addr baseAddr = localApicBase.base * PageBytes;
- Addr paddr = req->getPaddr();
- if (baseAddr <= paddr && baseAddr + PageBytes > paddr) {
- // The Intel developer's manuals say the below restrictions apply,
- // but the linux kernel, because of a compiler optimization, breaks
- // them.
- /*
- // Check alignment
- if (paddr & ((32/8) - 1))
- return new GeneralProtection(0);
- // Check access size
- if (req->getSize() != (32/8))
- return new GeneralProtection(0);
- */
- // Force the access to be uncacheable.
- req->setFlags(req->getFlags() | UNCACHEABLE);
- req->setPaddr(x86LocalAPICAddress(tc->cpuId(), paddr - baseAddr));
- }
-#endif
- return NoFault;
-};
-Fault
-DTB::translate(RequestPtr &req, ThreadContext *tc, bool write)
-{
- return TLB::translate<FakeDTLBFault>(req, tc, write, false);
+ return finalizePhysical(req, tc, mode);
}
Fault
-ITB::translate(RequestPtr &req, ThreadContext *tc)
+TLB::translateAtomic(RequestPtr req, ThreadContext *tc, Mode mode)
{
- return TLB::translate<FakeITLBFault>(req, tc, false, true);
+ bool delayedResponse;
+ return TLB::translate(req, tc, NULL, mode, delayedResponse, false);
}
-#if FULL_SYSTEM
-
-Tick
-DTB::doMmuRegRead(ThreadContext *tc, Packet *pkt)
+void
+TLB::translateTiming(RequestPtr req, ThreadContext *tc,
+ Translation *translation, Mode mode)
{
- return tc->getCpuPtr()->ticks(1);
+ bool delayedResponse;
+ assert(translation);
+ Fault fault =
+ TLB::translate(req, tc, translation, mode, delayedResponse, true);
+ if (!delayedResponse)
+ translation->finish(fault, req, tc, mode);
}
-Tick
-DTB::doMmuRegWrite(ThreadContext *tc, Packet *pkt)
+Fault
+TLB::translateFunctional(RequestPtr req, ThreadContext *tc, Mode mode)
{
- return tc->getCpuPtr()->ticks(1);
+ panic("Not implemented\n");
+ return NoFault;
}
-#endif
+Walker *
+TLB::getWalker()
+{
+ return walker;
+}
void
TLB::serialize(std::ostream &os)
{
+ // Only store the entries in use.
+ uint32_t _size = size - freeList.size();
+ SERIALIZE_SCALAR(_size);
+ SERIALIZE_SCALAR(lruSeq);
+
+ uint32_t _count = 0;
+
+ for (uint32_t x = 0; x < size; x++) {
+ if (tlb[x].trieHandle != NULL) {
+ os << "\n[" << csprintf("%s.Entry%d", name(), _count) << "]\n";
+ tlb[x].serialize(os);
+ _count++;
+ }
+ }
}
void
TLB::unserialize(Checkpoint *cp, const std::string §ion)
{
-}
+ // Do not allow to restore with a smaller tlb.
+ uint32_t _size;
+ UNSERIALIZE_SCALAR(_size);
+ if (_size > size) {
+ fatal("TLB size less than the one in checkpoint!");
+ }
-void
-DTB::serialize(std::ostream &os)
-{
- TLB::serialize(os);
-}
+ UNSERIALIZE_SCALAR(lruSeq);
-void
-DTB::unserialize(Checkpoint *cp, const std::string §ion)
-{
- TLB::unserialize(cp, section);
-}
+ for (uint32_t x = 0; x < _size; x++) {
+ TlbEntry *newEntry = freeList.front();
+ freeList.pop_front();
-/* end namespace X86ISA */ }
+ newEntry->unserialize(cp, csprintf("%s.Entry%d", name(), x));
+ newEntry->trieHandle = trie.insert(newEntry->vaddr,
+ TlbEntryTrie::MaxBits - newEntry->logBytes, newEntry);
+ }
+}
-X86ISA::ITB *
-X86ITBParams::create()
+BaseMasterPort *
+TLB::getMasterPort()
{
- return new X86ISA::ITB(this);
+ return &walker->getMasterPort("port");
}
-X86ISA::DTB *
-X86DTBParams::create()
+} // namespace X86ISA
+
+X86ISA::TLB *
+X86TLBParams::create()
{
- return new X86ISA::DTB(this);
+ return new X86ISA::TLB(this);
}
projects / gem5.git / blobdiff