1/*
2 * Copyright (c) 2007-2008 The Hewlett-Packard Development Company
3 * All rights reserved.
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software

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55#include "mem/packet_access.hh"
56#include "mem/page_table.hh"
57#include "mem/request.hh"
58#include "sim/full_system.hh"
59#include "sim/process.hh"
60
61namespace X86ISA {
62
63TLB::TLB(const Params *p) : BaseTLB(p), configAddress(0), size(p->size),
64 lruSeq(0)
65{
66 if (!size)
67 fatal("TLBs must have a non-zero size.\n");
68 tlb = new TlbEntry[size];
69 std::memset(tlb, 0, sizeof(TlbEntry) * size);
70
71 for (int x = 0; x < size; x++) {
72 tlb[x].trieHandle = NULL;
73 freeList.push_back(&tlb[x]);
74 }
75
76 walker = p->walker;
77 walker->setTLB(this);
78}
79
80void
81TLB::evictLRU()
82{
83 // Find the entry with the lowest (and hence least recently updated)
84 // sequence number.
85
86 unsigned lru = 0;
87 for (unsigned i = 1; i < size; i++) {
88 if (tlb[i].lruSeq < tlb[lru].lruSeq)
89 lru = i;
90 }
91
92 assert(tlb[lru].trieHandle);
93 trie.remove(tlb[lru].trieHandle);
94 tlb[lru].trieHandle = NULL;
95 freeList.push_back(&tlb[lru]);
96}
97
98TlbEntry *
99TLB::insert(Addr vpn, TlbEntry &entry)
100{
101 //TODO Deal with conflicting entries
102
103 TlbEntry *newEntry = NULL;
104 if (freeList.empty())
105 evictLRU();
106 newEntry = freeList.front();
107 freeList.pop_front();
108
109 *newEntry = entry;
110 newEntry->lruSeq = nextSeq();
111 newEntry->vaddr = vpn;
112 newEntry->trieHandle =
113 trie.insert(vpn, TlbEntryTrie::MaxBits - entry.logBytes, newEntry);
114 return newEntry;
115}
116
117TlbEntry *
118TLB::lookup(Addr va, bool update_lru)
119{
120 TlbEntry *entry = trie.lookup(va);
121 if (entry && update_lru)
122 entry->lruSeq = nextSeq();
123 return entry;
124}
125
126void
127TLB::invalidateAll()
128{
129 DPRINTF(TLB, "Invalidating all entries.\n");
130 for (unsigned i = 0; i < size; i++) {
131 if (tlb[i].trieHandle) {
132 trie.remove(tlb[i].trieHandle);
133 tlb[i].trieHandle = NULL;
134 freeList.push_back(&tlb[i]);
135 }
136 }
137}
138
139void
140TLB::setConfigAddress(uint32_t addr)
141{
142 configAddress = addr;
143}
144
145void
146TLB::invalidateNonGlobal()
147{
148 DPRINTF(TLB, "Invalidating all non global entries.\n");
149 for (unsigned i = 0; i < size; i++) {
150 if (tlb[i].trieHandle && !tlb[i].global) {
151 trie.remove(tlb[i].trieHandle);
152 tlb[i].trieHandle = NULL;
153 freeList.push_back(&tlb[i]);
154 }
155 }
156}
157
158void
159TLB::demapPage(Addr va, uint64_t asn)
160{
161 TlbEntry *entry = trie.lookup(va);
162 if (entry) {
163 trie.remove(entry->trieHandle);
164 entry->trieHandle = NULL;
165 freeList.push_back(entry);
166 }
167}
168
169Fault
170TLB::translateInt(RequestPtr req, ThreadContext *tc)
171{
172 DPRINTF(TLB, "Addresses references internal memory.\n");
173 Addr vaddr = req->getVaddr();

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343 return new PageFault(vaddr, true, mode, inUser, false);
344 }
345 if (storeCheck && badWrite) {
346 // This would fault if this were a write, so return a page
347 // fault that reflects that happening.
348 return new PageFault(vaddr, true, Write, inUser, false);
349 }
350
351 Addr paddr = entry->paddr | (vaddr & mask(entry->logBytes));
352 DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, paddr);
353 req->setPaddr(paddr);
354 if (entry->uncacheable)
355 req->setFlags(Request::UNCACHEABLE);
356 } else {
357 //Use the address which already has segmentation applied.
358 DPRINTF(TLB, "Paging disabled.\n");
359 DPRINTF(TLB, "Translated %#x -> %#x.\n", vaddr, vaddr);

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