diff --git a/tools/ed/EDDisassembler.cpp b/tools/ed/EDDisassembler.cpp
new file mode 100644
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+++ b/tools/ed/EDDisassembler.cpp
@@ -0,0 +1,445 @@
+//===-EDDisassembler.cpp - LLVM Enhanced Disassembler ---------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+// 
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Enhanced Disassembly library's  disassembler class.
+// The disassembler is responsible for vending individual instructions according
+// to a given architecture and disassembly syntax.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/OwningPtr.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCDisassembler.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstPrinter.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCParser/AsmLexer.h"
+#include "llvm/MC/MCParser/AsmParser.h"
+#include "llvm/MC/MCParser/MCAsmParser.h"
+#include "llvm/MC/MCParser/MCParsedAsmOperand.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/MemoryObject.h"
+#include "llvm/Support/SourceMgr.h"
+#include "llvm/Target/TargetAsmLexer.h"
+#include "llvm/Target/TargetAsmParser.h"
+#include "llvm/Target/TargetRegistry.h"
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/TargetSelect.h"
+
+#include "EDDisassembler.h"
+#include "EDInst.h"
+
+#include "../../lib/Target/X86/X86GenEDInfo.inc"
+
+using namespace llvm;
+
+bool EDDisassembler::sInitialized = false;
+EDDisassembler::DisassemblerMap_t EDDisassembler::sDisassemblers;
+
+struct InfoMap {
+  Triple::ArchType Arch;
+  const char *String;
+  const InstInfo *Info;
+};
+
+static struct InfoMap infomap[] = {
+  { Triple::x86,          "i386-unknown-unknown",   instInfoX86 },
+  { Triple::x86_64,       "x86_64-unknown-unknown", instInfoX86 },
+  { Triple::InvalidArch,  NULL,                     NULL        }
+};
+
+/// infoFromArch - Returns the InfoMap corresponding to a given architecture,
+///   or NULL if there is an error
+///
+/// @arg arch - The Triple::ArchType for the desired architecture
+static const InfoMap *infoFromArch(Triple::ArchType arch) {
+  unsigned int infoIndex;
+  
+  for (infoIndex = 0; infomap[infoIndex].String != NULL; ++infoIndex) {
+    if(arch == infomap[infoIndex].Arch)
+      return &infomap[infoIndex];
+  }
+  
+  return NULL;
+}
+
+/// getLLVMSyntaxVariant - gets the constant to use to get an assembly printer
+///   for the desired assembly syntax, suitable for passing to 
+///   Target::createMCInstPrinter()
+///
+/// @arg arch   - The target architecture
+/// @arg syntax - The assembly syntax in sd form
+static int getLLVMSyntaxVariant(Triple::ArchType arch,
+                                EDAssemblySyntax_t syntax) {
+  switch (syntax) {
+  default:
+    return -1;
+  // Mappings below from X86AsmPrinter.cpp
+  case kEDAssemblySyntaxX86ATT:
+    if (arch == Triple::x86 || arch == Triple::x86_64)
+      return 0;
+    else
+      return -1;
+  case kEDAssemblySyntaxX86Intel:
+    if (arch == Triple::x86 || arch == Triple::x86_64)
+      return 1;
+    else
+      return -1;
+  }
+}
+
+#define BRINGUP_TARGET(tgt)           \
+  LLVMInitialize##tgt##TargetInfo();  \
+  LLVMInitialize##tgt##Target();      \
+  LLVMInitialize##tgt##AsmPrinter();  \
+  LLVMInitialize##tgt##AsmParser();   \
+  LLVMInitialize##tgt##Disassembler();
+
+void EDDisassembler::initialize() {
+  if (sInitialized)
+    return;
+  
+  sInitialized = true;
+  
+  BRINGUP_TARGET(X86)
+}
+
+#undef BRINGUP_TARGET
+
+EDDisassembler *EDDisassembler::getDisassembler(Triple::ArchType arch,
+                                                EDAssemblySyntax_t syntax) {
+  CPUKey key;
+  key.Arch = arch;
+  key.Syntax = syntax;
+  
+  EDDisassembler::DisassemblerMap_t::iterator i = sDisassemblers.find(key);
+  
+  if (i != sDisassemblers.end()) {
+    return i->second;
+  }
+  else {
+    EDDisassembler* sdd = new EDDisassembler(key);
+    if(!sdd->valid()) {
+      delete sdd;
+      return NULL;
+    }
+    
+    sDisassemblers[key] = sdd;
+    
+    return sdd;
+  }
+  
+  return NULL;
+}
+
+EDDisassembler *EDDisassembler::getDisassembler(StringRef str,
+                                                EDAssemblySyntax_t syntax) {
+  Triple triple(str);
+  
+  return getDisassembler(triple.getArch(), syntax);
+}
+
+namespace {
+  class EDAsmParser : public MCAsmParser {
+    AsmLexer Lexer;
+    MCContext Context;
+    OwningPtr<MCStreamer> Streamer;
+  public:
+    // Mandatory functions
+    EDAsmParser(const MCAsmInfo &MAI) : Lexer(MAI) {
+      Streamer.reset(createNullStreamer(Context));
+    }
+    virtual ~EDAsmParser() { }
+    MCAsmLexer &getLexer() { return Lexer; }
+    MCContext &getContext() { return Context; }
+    MCStreamer &getStreamer() { return *Streamer; }
+    void Warning(SMLoc L, const Twine &Msg) { }
+    bool Error(SMLoc L, const Twine &Msg) { return true; }
+    const AsmToken &Lex() { return Lexer.Lex(); }
+    bool ParseExpression(const MCExpr *&Res, SMLoc &EndLoc) {
+      AsmToken token = Lex();
+      if(token.isNot(AsmToken::Integer))
+        return true;
+      Res = MCConstantExpr::Create(token.getIntVal(), Context);
+      return false;
+    }
+    bool ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) {
+      assert(0 && "I can't ParseParenExpression()s!");
+    }
+    bool ParseAbsoluteExpression(int64_t &Res) {
+      assert(0 && "I can't ParseAbsoluteExpression()s!");
+    }
+    
+    /// setBuffer - loads a buffer into the parser
+    /// @arg buf  - The buffer to read tokens from
+    void setBuffer(const MemoryBuffer &buf) { Lexer.setBuffer(&buf); }
+    /// parseInstName - When the lexer is positioned befor an instruction
+    ///   name (with possible intervening whitespace), reads past the name,
+    ///   returning 0 on success and -1 on failure
+    /// @arg name - A reference to a string that is filled in with the
+    ///             instruction name
+    /// @arg loc  - A reference to a location that is filled in with the
+    ///             position of the instruction name
+    int parseInstName(StringRef &name, SMLoc &loc) {
+      AsmToken tok = Lexer.Lex();
+      if(tok.isNot(AsmToken::Identifier)) {
+        return -1;
+      }
+      name = tok.getString();
+      loc = tok.getLoc();
+      return 0;
+    }
+  };
+}
+
+EDDisassembler::EDDisassembler(CPUKey &key) : 
+  Valid(false), ErrorString(), ErrorStream(ErrorString), Key(key) {
+  const InfoMap *infoMap = infoFromArch(key.Arch);
+  
+  if (!infoMap)
+    return;
+  
+  const char *triple = infoMap->String;
+  
+  int syntaxVariant = getLLVMSyntaxVariant(key.Arch, key.Syntax);
+  
+  if (syntaxVariant < 0)
+    return;
+  
+  std::string tripleString(triple);
+  std::string errorString;
+  
+  Tgt = TargetRegistry::lookupTarget(tripleString, 
+                                     errorString);
+  
+  if (!Tgt)
+    return;
+  
+  std::string featureString;
+  
+  OwningPtr<const TargetMachine>
+    targetMachine(Tgt->createTargetMachine(tripleString,
+                                           featureString));
+  
+  const TargetRegisterInfo *registerInfo = targetMachine->getRegisterInfo();
+  
+  if (!registerInfo)
+    return;
+  
+  AsmInfo.reset(Tgt->createAsmInfo(tripleString));
+  
+  if (!AsmInfo)
+    return;
+  
+  Disassembler.reset(Tgt->createMCDisassembler());
+  
+  if (!Disassembler)
+    return;
+  
+  InstString.reset(new std::string);
+  InstStream.reset(new raw_string_ostream(*InstString));
+  
+  InstPrinter.reset(Tgt->createMCInstPrinter(syntaxVariant,
+                                                *AsmInfo,
+                                                *InstStream));
+  
+  if (!InstPrinter)
+    return;
+    
+  GenericAsmLexer.reset(new AsmLexer(*AsmInfo));
+  SpecificAsmLexer.reset(Tgt->createAsmLexer(*AsmInfo));
+  SpecificAsmLexer->InstallLexer(*GenericAsmLexer);
+                          
+  InstInfos = infoMap->Info;
+    
+  Valid = true;
+}
+
+EDDisassembler::~EDDisassembler() {
+  if(!valid())
+    return;
+}
+
+namespace {
+  /// EDMemoryObject - a subclass of MemoryObject that allows use of a callback
+  ///   as provided by the sd interface.  See MemoryObject.
+  class EDMemoryObject : public llvm::MemoryObject {
+  private:
+    EDByteReaderCallback Callback;
+    void *Arg;
+  public:
+    EDMemoryObject(EDByteReaderCallback callback,
+                   void *arg) : Callback(callback), Arg(arg) { }
+    ~EDMemoryObject() { }
+    uint64_t getBase() const { return 0x0; }
+    uint64_t getExtent() const { return (uint64_t)-1; }
+    int readByte(uint64_t address, uint8_t *ptr) const {
+      if(!Callback)
+        return -1;
+      
+      if(Callback(ptr, address, Arg))
+        return -1;
+      
+      return 0;
+    }
+  };
+}
+
+EDInst *EDDisassembler::createInst(EDByteReaderCallback byteReader, 
+                                   uint64_t address, 
+                                   void *arg) {
+  EDMemoryObject memoryObject(byteReader, arg);
+  
+  MCInst* inst = new MCInst;
+  uint64_t byteSize;
+  
+  if (!Disassembler->getInstruction(*inst,
+                                    byteSize,
+                                    memoryObject,
+                                    address,
+                                    ErrorStream)) {
+    delete inst;
+    return NULL;
+  }
+  else {
+    const InstInfo *thisInstInfo = &InstInfos[inst->getOpcode()];
+    
+    EDInst* sdInst = new EDInst(inst, byteSize, *this, thisInstInfo);
+    return sdInst;
+  }
+}
+
+void EDDisassembler::initMaps(const TargetRegisterInfo &registerInfo) {
+  unsigned numRegisters = registerInfo.getNumRegs();
+  unsigned registerIndex;
+  
+  for (registerIndex = 0; registerIndex < numRegisters; ++registerIndex) {
+    const char* registerName = registerInfo.get(registerIndex).Name;
+    
+    RegVec.push_back(registerName);
+    RegRMap[registerName] = registerIndex;
+  }
+  
+  if (Key.Arch == Triple::x86 ||
+      Key.Arch == Triple::x86_64) {
+    stackPointers.insert(registerIDWithName("SP"));
+    stackPointers.insert(registerIDWithName("ESP"));
+    stackPointers.insert(registerIDWithName("RSP"));
+    
+    programCounters.insert(registerIDWithName("IP"));
+    programCounters.insert(registerIDWithName("EIP"));
+    programCounters.insert(registerIDWithName("RIP"));
+  }
+}
+
+const char *EDDisassembler::nameWithRegisterID(unsigned registerID) const {
+  if (registerID >= RegVec.size())
+    return NULL;
+  else
+    return RegVec[registerID].c_str();
+}
+
+unsigned EDDisassembler::registerIDWithName(const char *name) const {
+  regrmap_t::const_iterator iter = RegRMap.find(std::string(name));
+  if (iter == RegRMap.end())
+    return 0;
+  else
+    return (*iter).second;
+}
+
+bool EDDisassembler::registerIsStackPointer(unsigned registerID) {
+  return (stackPointers.find(registerID) != stackPointers.end());
+}
+
+bool EDDisassembler::registerIsProgramCounter(unsigned registerID) {
+  return (programCounters.find(registerID) != programCounters.end());
+}
+
+int EDDisassembler::printInst(std::string& str,
+                              MCInst& inst) {
+  PrinterMutex.acquire();
+  
+  InstPrinter->printInst(&inst);
+  InstStream->flush();
+  str = *InstString;
+  InstString->clear();
+  
+  PrinterMutex.release();
+  
+  return 0;
+}
+
+int EDDisassembler::parseInst(SmallVectorImpl<MCParsedAsmOperand*> &operands,
+                              SmallVectorImpl<AsmToken> &tokens,
+                              const std::string &str) {
+  int ret = 0;
+  
+  const char *cStr = str.c_str();
+  MemoryBuffer *buf = MemoryBuffer::getMemBuffer(cStr, cStr + strlen(cStr));
+  
+  StringRef instName;
+  SMLoc instLoc;
+  
+  SourceMgr sourceMgr;
+  sourceMgr.AddNewSourceBuffer(buf, SMLoc()); // ownership of buf handed over
+  MCContext context;
+  OwningPtr<MCStreamer> streamer
+    (createNullStreamer(context));
+  AsmParser genericParser(sourceMgr, context, *streamer, *AsmInfo);
+  OwningPtr<TargetAsmParser> specificParser
+    (Tgt->createAsmParser(genericParser));
+  
+  AsmToken OpcodeToken = genericParser.Lex();
+  
+  if(OpcodeToken.is(AsmToken::Identifier)) {
+    instName = OpcodeToken.getString();
+    instLoc = OpcodeToken.getLoc();
+    if (specificParser->ParseInstruction(instName, instLoc, operands))
+      ret = -1;
+  }
+  else {
+    ret = -1;
+  }
+  
+  SmallVectorImpl<MCParsedAsmOperand*>::iterator oi;
+  
+  for(oi = operands.begin(); oi != operands.end(); ++oi) {
+    printf("Operand start %p, end %p\n", 
+           (*oi)->getStartLoc().getPointer(),
+           (*oi)->getEndLoc().getPointer());
+  }
+  
+  ParserMutex.acquire();
+  
+  if (!ret) {
+    GenericAsmLexer->setBuffer(buf);
+  
+    while (SpecificAsmLexer->Lex(),
+           SpecificAsmLexer->isNot(AsmToken::Eof) &&
+           SpecificAsmLexer->isNot(AsmToken::EndOfStatement)) {
+      if (SpecificAsmLexer->is(AsmToken::Error)) {
+        ret = -1;
+        break;
+      }
+      tokens.push_back(SpecificAsmLexer->getTok());
+    }
+  }
+
+  ParserMutex.release();
+  
+  return ret;
+}
+
+int EDDisassembler::llvmSyntaxVariant() const {
+  return LLVMSyntaxVariant;
+}