diff --git a/src/gopheros/device/acpi/aml/parser_opcode_table.go b/src/gopheros/device/acpi/aml/parser_opcode_table.go
index c1c43f8..74bb7f9 100644
--- a/src/gopheros/device/acpi/aml/parser_opcode_table.go
+++ b/src/gopheros/device/acpi/aml/parser_opcode_table.go
@@ -196,3 +196,332 @@ func pOpIsDataObject(op uint16) bool {
 		return false
 	}
 }
+
+const (
+	badOpcode   = 0xff
+	extOpPrefix = 0x5b
+)
+
+// pOpFlag specifies a list of OR-able flags that describe the object
+// type/attributes generated by a particular opcode.
+type pOpFlag uint8
+
+const (
+	pOpFlagNamed = 1 << iota
+	pOpFlagConstant
+	pOpFlagReference
+	pOpFlagCreate
+	pOpFlagExecutable
+	pOpFlagScoped
+	pOpFlagDeferParsing
+)
+
+// pOpArgTypeList encodes up to 7 opArgFlag values in a uint64 value.
+type pOpArgTypeList uint64
+
+// argCount returns the number of encoded args in the given arg type list.
+func (fl pOpArgTypeList) argCount() (count uint8) {
+	// Each argument is specified using 8 bits with 0x0 indicating the end of the
+	// argument list
+	for ; fl&0xf != 0; fl, count = fl>>8, count+1 {
+	}
+
+	return count
+}
+
+// arg returns the arg type for argument "num" where num is the 0-based index
+// of the argument to return. The allowed values for num are 0-6.
+func (fl pOpArgTypeList) arg(num uint8) pArgType {
+	return pArgType((fl >> (num * 8)) & 0xf)
+}
+
+// pArgType represents the type of an argument expected by a particular opcode.
+type pArgType uint8
+
+// The list of supported opArgFlag values.
+const (
+	_ pArgType = iota
+	pArgTypeTermList
+	pArgTypeTermArg
+	pArgTypeByteList
+	pArgTypeString
+	pArgTypeByteData
+	pArgTypeWordData
+	pArgTypeDwordData
+	pArgTypeQwordData
+	pArgTypeNameString
+	pArgTypeSuperName
+	pArgTypeSimpleName
+	pArgTypeDataRefObj
+	pArgTypeTarget
+	pArgTypeFieldList
+	pArgTypePkgLen
+)
+
+func makeArg0() pOpArgTypeList              { return 0 }
+func makeArg1(arg0 pArgType) pOpArgTypeList { return pOpArgTypeList(arg0) }
+func makeArg2(arg0, arg1 pArgType) pOpArgTypeList {
+	return pOpArgTypeList(arg1)<<8 | pOpArgTypeList(arg0)
+}
+func makeArg3(arg0, arg1, arg2 pArgType) pOpArgTypeList {
+	return pOpArgTypeList(arg2)<<16 | pOpArgTypeList(arg1)<<8 | pOpArgTypeList(arg0)
+}
+func makeArg4(arg0, arg1, arg2, arg3 pArgType) pOpArgTypeList {
+	return pOpArgTypeList(arg3)<<24 | pOpArgTypeList(arg2)<<16 | pOpArgTypeList(arg1)<<8 | pOpArgTypeList(arg0)
+}
+func makeArg5(arg0, arg1, arg2, arg3, arg4 pArgType) pOpArgTypeList {
+	return pOpArgTypeList(arg4)<<32 | pOpArgTypeList(arg3)<<24 | pOpArgTypeList(arg2)<<16 | pOpArgTypeList(arg1)<<8 | pOpArgTypeList(arg0)
+}
+func makeArg6(arg0, arg1, arg2, arg3, arg4, arg5 pArgType) pOpArgTypeList {
+	return pOpArgTypeList(arg5)<<40 | pOpArgTypeList(arg4)<<32 | pOpArgTypeList(arg3)<<24 | pOpArgTypeList(arg2)<<16 | pOpArgTypeList(arg1)<<8 | pOpArgTypeList(arg0)
+}
+func makeArg7(arg0, arg1, arg2, arg3, arg4, arg5, arg6 pArgType) pOpArgTypeList {
+	return pOpArgTypeList(arg6)<<48 | pOpArgTypeList(arg5)<<40 | pOpArgTypeList(arg4)<<32 | pOpArgTypeList(arg3)<<24 | pOpArgTypeList(arg2)<<16 | pOpArgTypeList(arg1)<<8 | pOpArgTypeList(arg0)
+}
+
+// pOpcodeInfo contains all known information about an opcode,
+// its argument count and types as well as the type of object
+// represented by it.
+type pOpcodeInfo struct {
+	op     uint16
+	opName string
+
+	flags    pOpFlag
+	argFlags pOpArgTypeList
+}
+
+// The opcode table contains all opcode-related information that the parser knows.
+// This table is modeled after a similar table used in the acpica implementation.
+var pOpcodeTable = []pOpcodeInfo{
+	/*0x00*/ {pOpZero, "Zero", pOpFlagConstant, makeArg0()},
+	/*0x01*/ {pOpOne, "One", pOpFlagConstant, makeArg0()},
+	/*0x02*/ {pOpAlias, "Alias", pOpFlagNamed, makeArg2(pArgTypeNameString, pArgTypeNameString)},
+	/*0x03*/ {pOpName, "Name", pOpFlagNamed, makeArg2(pArgTypeNameString, pArgTypeDataRefObj)},
+	/*0x04*/ {pOpBytePrefix, "BytePrefix", pOpFlagConstant, makeArg1(pArgTypeByteData)},
+	/*0x05*/ {pOpWordPrefix, "WordPrefix", pOpFlagConstant, makeArg1(pArgTypeWordData)},
+	/*0x06*/ {pOpDwordPrefix, "DwordPrefix", pOpFlagConstant, makeArg1(pArgTypeDwordData)},
+	/*0x07*/ {pOpStringPrefix, "StringPrefix", pOpFlagConstant, makeArg1(pArgTypeString)},
+	/*0x08*/ {pOpQwordPrefix, "QwordPrefix", pOpFlagConstant, makeArg1(pArgTypeQwordData)},
+	/*0x09*/ {pOpScope, "Scope", 0, makeArg3(pArgTypePkgLen, pArgTypeNameString, pArgTypeTermList)},
+	/*0x0a*/ {pOpBuffer, "Buffer", pOpFlagDeferParsing | pOpFlagCreate, makeArg3(pArgTypePkgLen, pArgTypeTermArg, pArgTypeByteList)},
+	/*0x0b*/ {pOpPackage, "Package", pOpFlagCreate, makeArg3(pArgTypePkgLen, pArgTypeByteData, pArgTypeTermList)},
+	/*0x0c*/ {pOpVarPackage, "VarPackage", pOpFlagCreate, makeArg3(pArgTypePkgLen, pArgTypeByteData, pArgTypeTermList)},
+	/*0x0d*/ {pOpMethod, "Method", pOpFlagNamed | pOpFlagScoped, makeArg4(pArgTypePkgLen, pArgTypeNameString, pArgTypeByteData, pArgTypeTermList)},
+	/*0x0e*/ {pOpExternal, "External", pOpFlagNamed, makeArg3(pArgTypeNameString, pArgTypeByteData, pArgTypeByteData)},
+	/*0x0f*/ {pOpLocal0, "Local0", pOpFlagExecutable, makeArg0()},
+	/*0x10*/ {pOpLocal1, "Local1", pOpFlagExecutable, makeArg0()},
+	/*0x11*/ {pOpLocal2, "Local2", pOpFlagExecutable, makeArg0()},
+	/*0x12*/ {pOpLocal3, "Local3", pOpFlagExecutable, makeArg0()},
+	/*0x13*/ {pOpLocal4, "Local4", pOpFlagExecutable, makeArg0()},
+	/*0120*/ {pOpLocal5, "Local5", pOpFlagExecutable, makeArg0()},
+	/*0x15*/ {pOpLocal6, "Local6", pOpFlagExecutable, makeArg0()},
+	/*0x16*/ {pOpLocal7, "Local7", pOpFlagExecutable, makeArg0()},
+	/*0x17*/ {pOpArg0, "Arg0", pOpFlagExecutable, makeArg0()},
+	/*0x18*/ {pOpArg1, "Arg1", pOpFlagExecutable, makeArg0()},
+	/*0x19*/ {pOpArg2, "Arg2", pOpFlagExecutable, makeArg0()},
+	/*0x1a*/ {pOpArg3, "Arg3", pOpFlagExecutable, makeArg0()},
+	/*0x1b*/ {pOpArg4, "Arg4", pOpFlagExecutable, makeArg0()},
+	/*0x1c*/ {pOpArg5, "Arg5", pOpFlagExecutable, makeArg0()},
+	/*0x1d*/ {pOpArg6, "Arg6", pOpFlagExecutable, makeArg0()},
+	/*0x1e*/ {pOpStore, "Store", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeSuperName)},
+	/*0x1f*/ {pOpRefOf, "RefOf", pOpFlagReference | pOpFlagExecutable, makeArg1(pArgTypeSuperName)},
+	/*0x20*/ {pOpAdd, "Add", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x21*/ {pOpConcat, "Concat", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x22*/ {pOpSubtract, "Subtract", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x23*/ {pOpIncrement, "Increment", pOpFlagExecutable, makeArg1(pArgTypeSuperName)},
+	/*0x24*/ {pOpDecrement, "Decrement", pOpFlagExecutable, makeArg1(pArgTypeSuperName)},
+	/*0x25*/ {pOpMultiply, "Multiply", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x26*/ {pOpDivide, "Divide", pOpFlagExecutable, makeArg4(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget, pArgTypeTarget)},
+	/*0x27*/ {pOpShiftLeft, "ShiftLeft", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x28*/ {pOpShiftRight, "ShiftRight", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x29*/ {pOpAnd, "And", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x2a*/ {pOpNand, "Nand", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x2b*/ {pOpOr, "Or", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x2c*/ {pOpNor, "Nor", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x2d*/ {pOpXor, "Xor", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x2e*/ {pOpNot, "Not", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTarget)},
+	/*0x2f*/ {pOpFindSetLeftBit, "FindSetLeftBit", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTarget)},
+	/*0x30*/ {pOpFindSetRightBit, "FindSetRightBit", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTarget)},
+	/*0x31*/ {pOpDerefOf, "DerefOf", pOpFlagExecutable, makeArg1(pArgTypeTermArg)},
+	/*0x32*/ {pOpConcatRes, "ConcatRes", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x33*/ {pOpMod, "Mod", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x34*/ {pOpNotify, "Notify", pOpFlagExecutable, makeArg2(pArgTypeSuperName, pArgTypeTermArg)},
+	/*0x35*/ {pOpSizeOf, "SizeOf", pOpFlagExecutable, makeArg1(pArgTypeSuperName)},
+	/*0x36*/ {pOpIndex, "Index", pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x37*/ {pOpMatch, "Match", pOpFlagExecutable, makeArg6(pArgTypeTermArg, pArgTypeByteData, pArgTypeTermArg, pArgTypeByteData, pArgTypeTermArg, pArgTypeTermArg)},
+	/*0x38*/ {pOpCreateDWordField, "CreateDWordField", pOpFlagCreate | pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeNameString)},
+	/*0x39*/ {pOpCreateWordField, "CreateWordField", pOpFlagCreate | pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeNameString)},
+	/*0x3a*/ {pOpCreateByteField, "CreateByteField", pOpFlagCreate | pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeNameString)},
+	/*0x3b*/ {pOpCreateBitField, "CreateBitField", pOpFlagCreate | pOpFlagExecutable, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeNameString)},
+	/*0x3c*/ {pOpObjectType, "ObjectType", pOpFlagExecutable, makeArg1(pArgTypeSuperName)},
+	/*0x3d*/ {pOpCreateQWordField, "CreateQWordField", pOpFlagCreate, makeArg3(pArgTypeTermArg, pArgTypeTermArg, pArgTypeNameString)},
+	/*0x3e*/ {pOpLand, "Land", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTermArg)},
+	/*0x3f*/ {pOpLor, "Lor", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTermArg)},
+	/*0x40*/ {pOpLnot, "Lnot", pOpFlagExecutable, makeArg1(pArgTypeTermArg)},
+	/*0x41*/ {pOpLEqual, "LEqual", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTermArg)},
+	/*0x42*/ {pOpLGreater, "LGreater", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTermArg)},
+	/*0x43*/ {pOpLLess, "LLess", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTermArg)},
+	/*0x44*/ {pOpToBuffer, "ToBuffer", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTarget)},
+	/*0x45*/ {pOpToDecimalString, "ToDecimalString", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTarget)},
+	/*0x46*/ {pOpToHexString, "ToHexString", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTarget)},
+	/*0x47*/ {pOpToInteger, "ToInteger", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTarget)},
+	/*0x48*/ {pOpToString, "ToString", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTarget)},
+	/*0x49*/ {pOpCopyObject, "CopyObject", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeSimpleName)},
+	/*0x4a*/ {pOpMid, "Mid", pOpFlagExecutable, makeArg4(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTermArg, pArgTypeTarget)},
+	/*0x4b*/ {pOpContinue, "Continue", pOpFlagExecutable, makeArg0()},
+	/*0x4c*/ {pOpIf, "If", pOpFlagExecutable | pOpFlagScoped, makeArg3(pArgTypePkgLen, pArgTypeTermArg, pArgTypeTermList)},
+	/*0x4d*/ {pOpElse, "Else", pOpFlagExecutable | pOpFlagScoped, makeArg2(pArgTypePkgLen, pArgTypeTermList)},
+	/*0x4e*/ {pOpWhile, "While", pOpFlagDeferParsing | pOpFlagExecutable | pOpFlagScoped, makeArg3(pArgTypePkgLen, pArgTypeTermArg, pArgTypeTermList)},
+	/*0x4f*/ {pOpNoop, "Noop", pOpFlagExecutable, makeArg0()},
+	/*0x50*/ {pOpReturn, "Return", pOpFlagExecutable, makeArg1(pArgTypeTermArg)},
+	/*0x51*/ {pOpBreak, "Break", pOpFlagExecutable, makeArg0()},
+	/*0x52*/ {pOpBreakPoint, "BreakPoint", pOpFlagExecutable, makeArg0()},
+	/*0x53*/ {pOpOnes, "Ones", pOpFlagConstant, makeArg0()},
+	/*0x54*/ {pOpMutex, "Mutex", pOpFlagNamed, makeArg2(pArgTypeNameString, pArgTypeByteData)},
+	/*0x55*/ {pOpEvent, "Event", pOpFlagNamed, makeArg1(pArgTypeNameString)},
+	/*0x56*/ {pOpCondRefOf, "CondRefOf", pOpFlagExecutable, makeArg2(pArgTypeSuperName, pArgTypeSuperName)},
+	/*0x57*/ {pOpCreateField, "CreateField", pOpFlagExecutable, makeArg4(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTermArg, pArgTypeNameString)},
+	/*0x58*/ {pOpLoadTable, "LoadTable", pOpFlagExecutable, makeArg7(pArgTypeTermArg, pArgTypeTermArg, pArgTypeTermArg, pArgTypeTermArg, pArgTypeTermArg, pArgTypeTermArg, pArgTypeTermArg)},
+	/*0x59*/ {pOpLoad, "Load", pOpFlagExecutable, makeArg2(pArgTypeNameString, pArgTypeSuperName)},
+	/*0x5a*/ {pOpStall, "Stall", pOpFlagExecutable, makeArg1(pArgTypeTermArg)},
+	/*0x5b*/ {pOpSleep, "Sleep", pOpFlagExecutable, makeArg1(pArgTypeTermArg)},
+	/*0x5c*/ {pOpAcquire, "Acquire", pOpFlagExecutable, makeArg2(pArgTypeSuperName, pArgTypeWordData)},
+	/*0x5d*/ {pOpSignal, "Signal", pOpFlagExecutable, makeArg1(pArgTypeTermArg)},
+	/*0x5e*/ {pOpWait, "Wait", pOpFlagExecutable, makeArg2(pArgTypeSuperName, pArgTypeTermArg)},
+	/*0x5f*/ {pOpReset, "Reset", pOpFlagExecutable, makeArg1(pArgTypeSuperName)},
+	/*0x60*/ {pOpRelease, "Release", pOpFlagExecutable, makeArg1(pArgTypeSuperName)},
+	/*0x61*/ {pOpFromBCD, "FromBCD", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTarget)},
+	/*0x62*/ {pOpToBCD, "ToBCD", pOpFlagExecutable, makeArg2(pArgTypeTermArg, pArgTypeTarget)},
+	/*0x63*/ {pOpUnload, "Unload", pOpFlagExecutable, makeArg1(pArgTypeSuperName)},
+	/*0x64*/ {pOpRevision, "Revision", pOpFlagConstant | pOpFlagExecutable, makeArg0()},
+	/*0x65*/ {pOpDebug, "Debug", pOpFlagExecutable, makeArg0()},
+	/*0x66*/ {pOpFatal, "Fatal", pOpFlagExecutable, makeArg3(pArgTypeByteData, pArgTypeDwordData, pArgTypeTermArg)},
+	/*0x67*/ {pOpTimer, "Timer", pOpFlagExecutable, makeArg0()},
+	/*0x68*/ {pOpOpRegion, "OpRegion", pOpFlagNamed, makeArg4(pArgTypeNameString, pArgTypeByteData, pArgTypeTermArg, pArgTypeTermArg)},
+	/*0x69*/ {pOpField, "Field", pOpFlagCreate, makeArg4(pArgTypePkgLen, pArgTypeNameString, pArgTypeByteData, pArgTypeFieldList)},
+	/*0x6a*/ {pOpDevice, "Device", pOpFlagNamed | pOpFlagScoped, makeArg3(pArgTypePkgLen, pArgTypeNameString, pArgTypeTermList)},
+	/*0x6b*/ {pOpProcessor, "Processor", pOpFlagNamed | pOpFlagScoped, makeArg6(pArgTypePkgLen, pArgTypeNameString, pArgTypeByteData, pArgTypeDwordData, pArgTypeByteData, pArgTypeTermList)},
+	/*0x6c*/ {pOpPowerRes, "PowerRes", pOpFlagNamed | pOpFlagScoped, makeArg5(pArgTypePkgLen, pArgTypeNameString, pArgTypeByteData, pArgTypeWordData, pArgTypeTermList)},
+	/*0x6d*/ {pOpThermalZone, "ThermalZone", pOpFlagNamed | pOpFlagScoped, makeArg3(pArgTypePkgLen, pArgTypeNameString, pArgTypeTermList)},
+	/*0x6e*/ {pOpIndexField, "IndexField", pOpFlagCreate | pOpFlagNamed, makeArg5(pArgTypePkgLen, pArgTypeNameString, pArgTypeNameString, pArgTypeByteData, pArgTypeFieldList)},
+	/*0x6f*/ {pOpBankField, "BankField", pOpFlagDeferParsing | pOpFlagCreate | pOpFlagNamed, makeArg6(pArgTypePkgLen, pArgTypeNameString, pArgTypeNameString, pArgTypeTermArg, pArgTypeByteData, pArgTypeFieldList)},
+	/*0x70*/ {pOpDataRegion, "DataRegion", pOpFlagCreate | pOpFlagNamed, makeArg4(pArgTypeNameString, pArgTypeTermArg, pArgTypeTermArg, pArgTypeTermArg)},
+	// Special internal opcodes
+	/*0xf7*/ {pOpIntScopeBlock, "ScopeBlock", pOpFlagCreate | pOpFlagNamed, makeArg1(pArgTypeTermList)},
+	/*0xf8*/ {pOpIntByteList, "ByteList", pOpFlagCreate, makeArg0()},
+	/*0xf9*/ {pOpIntConnection, "Connection", pOpFlagCreate, makeArg0()},
+	/*0xfa*/ {pOpIntNamedField, "NamedField", pOpFlagCreate, makeArg0()},
+	/*0xfb*/ {pOpIntResolvedNamePath, "ResolvedNamePath", pOpFlagCreate, makeArg0()},
+	/*0xfc*/ {pOpIntNamePath, "NamePath", pOpFlagCreate, makeArg0()},
+	/*0xfd*/ {pOpIntNamePathOrMethodCall, "NamePath or MethodCall", pOpFlagCreate, makeArg0()},
+	/*0xfe*/ {pOpIntMethodCall, "MethodCall", pOpFlagCreate, makeArg0()},
+}
+
+// opcodeMap maps an AML opcode to an entry in the opcode table. Entries with
+// the value 0xff indicate an invalid/unsupported opcode.
+var opcodeMap = [256]uint8{
+	/*              0     1     2     3     4     5     6     7*/
+	/*0x00 - 0x07*/ 0x00, 0x01, 0xff, 0xff, 0xff, 0xff, 0x02, 0xff,
+	/*0x08 - 0x0f*/ 0x03, 0xff, 0x04, 0x05, 0x06, 0x07, 0x08, 0xff,
+	/*0x10 - 0x17*/ 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0xff, 0xff,
+	/*0x18 - 0x1f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x20 - 0x27*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x28 - 0x2f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x30 - 0x37*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x38 - 0x3f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x40 - 0x47*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x48 - 0x4f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x50 - 0x57*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x58 - 0x5f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x60 - 0x67*/ 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
+	/*0x68 - 0x6f*/ 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0xff,
+	/*0x70 - 0x77*/ 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25,
+	/*0x78 - 0x7f*/ 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
+	/*0x80 - 0x87*/ 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35,
+	/*0x88 - 0x8f*/ 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d,
+	/*0x90 - 0x97*/ 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45,
+	/*0x98 - 0x9f*/ 0x46, 0x47, 0xff, 0xff, 0x48, 0x49, 0x4a, 0x4b,
+	/*0xa0 - 0xa7*/ 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0xff, 0xff,
+	/*0xa8 - 0xaf*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xb0 - 0xb7*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xb8 - 0xbf*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xc0 - 0xc7*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xc8 - 0xcf*/ 0xff, 0xff, 0xff, 0xff, 0x52, 0xff, 0xff, 0xff,
+	/*0xd0 - 0xd7*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xd8 - 0xdf*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xe0 - 0xe7*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xe8 - 0xef*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xf0 - 0xf7*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xf8 - 0xff*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x53,
+}
+
+// extendedOpcodeMap maps an AML extended opcode (extOpPrefix + code) to an
+// entry in the opcode table. Entries with the value 0xff indicate an
+// invalid/unsupported opcode.
+var extendedOpcodeMap = [256]uint8{
+	/*              0     1     2     3     4     5     6     7*/
+	/*0x00 - 0x07*/ 0xff, 0x54, 0x55, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x08 - 0x0f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x10 - 0x17*/ 0xff, 0xff, 0x56, 0x57, 0xff, 0xff, 0xff, 0xff,
+	/*0x18 - 0x1f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x58,
+	/*0x20 - 0x27*/ 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60,
+	/*0x28 - 0x2f*/ 0x61, 0x62, 0x63, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x30 - 0x37*/ 0x64, 0x65, 0x66, 0x67, 0xff, 0xff, 0xff, 0xff,
+	/*0x38 - 0x3f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x40 - 0x47*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x48 - 0x4f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x50 - 0x57*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x58 - 0x5f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x60 - 0x67*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x68 - 0x6f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x70 - 0x77*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x78 - 0x7f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x80 - 0x87*/ 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
+	/*0x88 - 0x8f*/ 0x70, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x90 - 0x97*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0x98 - 0x9f*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xa0 - 0xa7*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xa8 - 0xaf*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xb0 - 0xb7*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xb8 - 0xbf*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xc0 - 0xc7*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xc8 - 0xcf*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xd0 - 0xd7*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xd8 - 0xdf*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xe0 - 0xe7*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xe8 - 0xef*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xf0 - 0xf7*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+	/*0xf8 - 0xff*/ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+}
+
+// pOpcodeName returns the name of an opcode as a string.
+func pOpcodeName(opcode uint16) string {
+	index := pOpcodeTableIndex(opcode, true)
+	if index == badOpcode {
+		return "unknown"
+	}
+
+	return pOpcodeTable[index].opName
+}
+
+// pOpcodeTableIndex returns the opcode table index for opcode or badOpcode(0xff)
+// if opcode does not map to a valid opcode table entry.
+func pOpcodeTableIndex(opcode uint16, allowInternalOp bool) uint8 {
+	if opcode <= 0xff {
+		return opcodeMap[opcode]
+	}
+
+	index := extendedOpcodeMap[opcode-0xff]
+
+	// internal opcodes do not have entries in the extendedOpcodeMap. They get
+	// allocated descending opcode values starting from (0xff + 0xfe). They do
+	// however have entries in the opcodeTable. To calculate their index we use
+	// the following formula: len(opcodeTable) - 1 - (0x1fd - intOpcode) or the
+	// equivalent: len(opcodeTable) + (intOpcode - 0x1fe)
+	// with
+	if index == badOpcode && allowInternalOp {
+		index = uint8(len(pOpcodeTable) + int(opcode) - 0x1fe)
+	}
+
+	return index
+}
diff --git a/src/gopheros/device/acpi/aml/parser_opcode_table_test.go b/src/gopheros/device/acpi/aml/parser_opcode_table_test.go
index faa1c00..083a250 100644
--- a/src/gopheros/device/acpi/aml/parser_opcode_table_test.go
+++ b/src/gopheros/device/acpi/aml/parser_opcode_table_test.go
@@ -106,3 +106,38 @@ func TestOpcodeIsX(t *testing.T) {
 		}
 	}
 }
+
+func TestOpcodeName(t *testing.T) {
+	for specIndex, spec := range pOpcodeTable {
+		if got := pOpcodeName(spec.op); got != spec.opName {
+			t.Errorf("[spec %d] expected OpcodeName(0x%x) to return %q; got %q", specIndex, spec.op, spec.opName, got)
+		}
+	}
+
+	if exp, got := "unknown", pOpcodeName(0xf8); got != exp {
+		t.Fatalf("expected OpcodeName to return %q for unknown opcode; got %q", exp, got)
+	}
+}
+
+func TestOpcodeMap(t *testing.T) {
+	freqs := make(map[uint8]int)
+	for _, tableIndex := range opcodeMap {
+		if tableIndex == badOpcode {
+			continue
+		}
+		freqs[tableIndex]++
+	}
+
+	for _, tableIndex := range extendedOpcodeMap {
+		if tableIndex == badOpcode {
+			continue
+		}
+		freqs[tableIndex]++
+	}
+
+	for tableIndex, freq := range freqs {
+		if freq > 1 {
+			t.Errorf("[index 0x%x] found %d duplicate entries in opcodeMap/extendedOpcodeMap for %s", tableIndex, freq, pOpcodeTable[tableIndex].opName)
+		}
+	}
+}