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# Copyright (C) 2011 Red Hat, Inc., Michael S. Tsirkin <>
# This file may be distributed under the terms of the GNU GPLv3 license.
# Process mixed ASL/AML listing (.lst file) produced by iasl -l
# Locate and execute ACPI_EXTRACT directives, output offset info
# Documentation of ACPI_EXTRACT_* directive tags:
# These directive tags output offset information from AML for BIOS runtime
# table generation.
# Each directive is of the form:
# ACPI_EXTRACT_<TYPE> <array_name> <Operator> (...)
# and causes the extractor to create an array
# named <array_name> with offset, in the generated AML,
# of an object of a given type in the following <Operator>.
# A directive must fit on a single code line.
# Object type in AML is verified, a mismatch causes a build failure.
# Directives and operators currently supported are:
# ACPI_EXTRACT_NAME_DWORD_CONST - extract a Dword Const object from Name()
# ACPI_EXTRACT_NAME_WORD_CONST - extract a Word Const object from Name()
# ACPI_EXTRACT_NAME_BYTE_CONST - extract a Byte Const object from Name()
# ACPI_EXTRACT_METHOD_STRING - extract a NameString from Method()
# ACPI_EXTRACT_NAME_STRING - extract a NameString from Name()
# ACPI_EXTRACT_PROCESSOR_START - start of Processor() block
# ACPI_EXTRACT_PROCESSOR_STRING - extract a NameString from Processor()
# ACPI_EXTRACT_PROCESSOR_END - offset at last byte of Processor() + 1
# ACPI_EXTRACT_ALL_CODE - create an array storing the generated AML bytecode
# ACPI_EXTRACT is not allowed anywhere else in code, except in comments.
import re;
import sys;
import fileinput;
aml = []
asl = []
output = {}
debug = ""
class asl_line:
line = None
lineno = None
aml_offset = None
def die(diag):
sys.stderr.write("Error: %s; %s\n" % (diag, debug))
#Store an ASL command, matching AML offset, and input line (for debugging)
def add_asl(lineno, line):
l = asl_line()
l.line = line
l.lineno = lineno
l.aml_offset = len(aml)
#Store an AML byte sequence
#Verify that offset output by iasl matches # of bytes so far
def add_aml(offset, line):
o = int(offset, 16);
# Sanity check: offset must match size of code so far
if (o != len(aml)):
die("Offset 0x%x != 0x%x" % (o, len(aml)))
# Strip any trailing dots and ASCII dump after "
line = re.sub(r'\s*\.*\s*".*$',"", line)
# Strip traling whitespace
line = re.sub(r'\s+$',"", line)
# Strip leading whitespace
line = re.sub(r'^\s+',"", line)
# Split on whitespace
code = re.split(r'\s+', line)
for c in code:
# Require a legal hex number, two digits
if (not('^[0-9A-Fa-f][0-9A-Fa-f]$', c))):
die("Unexpected octet %s" % c);
aml.append(int(c, 16));
# Process aml bytecode array, decoding AML
def aml_pkglen_bytes(offset):
# PkgLength can be multibyte. Bits 8-7 give the # of extra bytes.
pkglenbytes = aml[offset] >> 6;
return pkglenbytes + 1
def aml_pkglen(offset):
pkgstart = offset
pkglenbytes = aml_pkglen_bytes(offset)
pkglen = aml[offset] & 0x3F
# If multibyte, first nibble only uses bits 0-3
if ((pkglenbytes > 0) and (pkglen & 0x30)):
die("PkgLen bytes 0x%x but first nibble 0x%x expected 0x0X" %
(pkglen, pkglen))
offset += 1
pkglenbytes -= 1
for i in range(pkglenbytes):
pkglen |= aml[offset + i] << (i * 8 + 4)
if (len(aml) < pkgstart + pkglen):
die("PckgLen 0x%x at offset 0x%x exceeds AML size 0x%x" %
(pkglen, offset, len(aml)))
return pkglen
# Given method offset, find its NameString offset
def aml_method_string(offset):
#0x14 MethodOp PkgLength NameString MethodFlags TermList
if (aml[offset] != 0x14):
die( "Method offset 0x%x: expected 0x14 actual 0x%x" %
(offset, aml[offset]));
offset += 1;
pkglenbytes = aml_pkglen_bytes(offset)
offset += pkglenbytes;
return offset;
# Given name offset, find its NameString offset
def aml_name_string(offset):
#0x08 NameOp NameString DataRef
if (aml[offset] != 0x08):
die( "Name offset 0x%x: expected 0x08 actual 0x%x" %
(offset, aml[offset]));
return offset + 1;
# Given data offset, find dword const offset
def aml_data_dword_const(offset):
#0x08 NameOp NameString DataRef
if (aml[offset] != 0x0C):
die( "Name offset 0x%x: expected 0x0C actual 0x%x" %
(offset, aml[offset]));
return offset + 1;
# Given data offset, find word const offset
def aml_data_word_const(offset):
#0x08 NameOp NameString DataRef
if (aml[offset] != 0x0B):
die( "Name offset 0x%x: expected 0x0B actual 0x%x" %
(offset, aml[offset]));
return offset + 1;
# Given data offset, find byte const offset
def aml_data_byte_const(offset):
#0x08 NameOp NameString DataRef
if (aml[offset] != 0x0A):
die( "Name offset 0x%x: expected 0x0A actual 0x%x" %
(offset, aml[offset]));
return offset + 1;
# Given name offset, find dword const offset
def aml_name_dword_const(offset):
return aml_data_dword_const(aml_name_string(offset) + 4)
# Given name offset, find word const offset
def aml_name_word_const(offset):
return aml_data_word_const(aml_name_string(offset) + 4)
# Given name offset, find byte const offset
def aml_name_byte_const(offset):
return aml_data_byte_const(aml_name_string(offset) + 4)
def aml_processor_start(offset):
#0x5B 0x83 ProcessorOp PkgLength NameString ProcID
if ((aml[offset] != 0x5B) or (aml[offset + 1] != 0x83)):
die( "Name offset 0x%x: expected 0x5B 0x83 actual 0x%x 0x%x" %
(offset, aml[offset], aml[offset + 1]));
return offset
def aml_processor_string(offset):
#0x5B 0x83 ProcessorOp PkgLength NameString ProcID
start = aml_processor_start(offset)
offset += 2
pkglenbytes = aml_pkglen_bytes(offset)
offset += pkglenbytes
return offset
def aml_processor_end(offset):
start = aml_processor_start(offset)
offset += 2
pkglenbytes = aml_pkglen_bytes(offset)
pkglen = aml_pkglen(offset)
return offset + pkglen
lineno = 0
for line in fileinput.input():
# Strip trailing newline
line = line.rstrip();
# line number and debug string to output in case of errors
lineno = lineno + 1
debug = "input line %d: %s" % (lineno, line)
#ASL listing: space, then line#, then ...., then code
pasl = re.compile('^\s+([0-9]+)\.\.\.\.\s*')
m =
if (m):
add_asl(lineno, pasl.sub("", line));
# AML listing: offset in hex, then ...., then code
paml = re.compile('^([0-9A-Fa-f]+)\.\.\.\.\s*')
m =
if (m):
add_aml(, paml.sub("", line))
# Now go over code
# Track AML offset of a previous non-empty ASL command
prev_aml_offset = -1
for i in range(len(asl)):
debug = "input line %d: %s" % (asl[i].lineno, asl[i].line)
l = asl[i].line
# skip if not an extract directive
a = len(re.findall(r'ACPI_EXTRACT', l))
if (not a):
# If not empty, store AML offset. Will be used for sanity checks
# IASL seems to put {}. at random places in the listing.
# Ignore any non-words for the purpose of this test.
m ='\w+', l)
if (m):
prev_aml_offset = asl[i].aml_offset
if (a > 1):
die("Expected at most one ACPI_EXTRACT per line, actual %d" % a)
mext ='''
^\s* # leading whitespace
/\*\s* # start C comment
(ACPI_EXTRACT_\w+) # directive: group(1)
\s+ # whitspace separates directive from array name
(\w+) # array name: group(2)
\s*\*/ # end of C comment
\s*$ # trailing whitespace
''', l, re.VERBOSE)
if (not mext):
die("Stray ACPI_EXTRACT in input")
# previous command must have produced some AML,
# otherwise we are in a middle of a block
if (prev_aml_offset == asl[i].aml_offset):
die("ACPI_EXTRACT directive in the middle of a block")
directive =
array =
offset = asl[i].aml_offset
if (directive == "ACPI_EXTRACT_ALL_CODE"):
if array in output:
die("%s directive used more than once" % directive)
output[array] = aml
if (directive == "ACPI_EXTRACT_NAME_DWORD_CONST"):
offset = aml_name_dword_const(offset)
elif (directive == "ACPI_EXTRACT_NAME_WORD_CONST"):
offset = aml_name_word_const(offset)
elif (directive == "ACPI_EXTRACT_NAME_BYTE_CONST"):
offset = aml_name_byte_const(offset)
elif (directive == "ACPI_EXTRACT_NAME_STRING"):
offset = aml_name_string(offset)
elif (directive == "ACPI_EXTRACT_METHOD_STRING"):
offset = aml_method_string(offset)
elif (directive == "ACPI_EXTRACT_PROCESSOR_START"):
offset = aml_processor_start(offset)
elif (directive == "ACPI_EXTRACT_PROCESSOR_STRING"):
offset = aml_processor_string(offset)
elif (directive == "ACPI_EXTRACT_PROCESSOR_END"):
offset = aml_processor_end(offset)
die("Unsupported directive %s" % directive)
if array not in output:
output[array] = []
debug = "at end of file"
def get_value_type(maxvalue):
#Use type large enough to fit the table
if (maxvalue >= 0x10000):
return "int"
elif (maxvalue >= 0x100):
return "short"
return "char"
# Pretty print output
for array in output.keys():
otype = get_value_type(max(output[array]))
odata = []
for value in output[array]:
odata.append("0x%x" % value)
sys.stdout.write("static unsigned %s %s[] = {\n" % (otype, array))