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#!/usr/bin/env python
#
# Copyright (c) 2014 Google, Inc
#
# SPDX-License-Identifier: GPL-2.0+
#
# Intel microcode update tool
from optparse import OptionParser
import os
import re
import struct
import sys
MICROCODE_DIR = 'arch/x86/dts/microcode'
class Microcode:
"""Holds information about the microcode for a particular model of CPU.
Attributes:
name: Name of the CPU this microcode is for, including any version
information (e.g. 'm12206a7_00000029')
model: Model code string (this is cpuid(1).eax, e.g. '206a7')
words: List of hex words containing the microcode. The first 16 words
are the public header.
"""
def __init__(self, name, data):
self.name = name
# Convert data into a list of hex words
self.words = []
for value in ''.join(data).split(','):
hexval = value.strip()
if hexval:
self.words.append(int(hexval, 0))
# The model is in the 4rd hex word
self.model = '%x' % self.words[3]
def ParseFile(fname):
"""Parse a micrcode.dat file and return the component parts
Args:
fname: Filename to parse
Returns:
3-Tuple:
date: String containing date from the file's header
license_text: List of text lines for the license file
microcodes: List of Microcode objects from the file
"""
re_date = re.compile('/\* *(.* [0-9]{4}) *\*/$')
re_license = re.compile('/[^-*+] *(.*)$')
re_name = re.compile('/\* *(.*)\.inc *\*/', re.IGNORECASE)
microcodes = {}
license_text = []
date = ''
data = []
name = None
with open(fname) as fd:
for line in fd:
line = line.rstrip()
m_date = re_date.match(line)
m_license = re_license.match(line)
m_name = re_name.match(line)
if m_name:
if name:
microcodes[name] = Microcode(name, data)
name = m_name.group(1).lower()
data = []
elif m_license:
license_text.append(m_license.group(1))
elif m_date:
date = m_date.group(1)
else:
data.append(line)
if name:
microcodes[name] = Microcode(name, data)
return date, license_text, microcodes
def List(date, microcodes, model):
"""List the available microcode chunks
Args:
date: Date of the microcode file
microcodes: Dict of Microcode objects indexed by name
model: Model string to search for, or None
"""
print 'Date: %s' % date
if model:
mcode_list, tried = FindMicrocode(microcodes, model.lower())
print 'Matching models %s:' % (', '.join(tried))
else:
print 'All models:'
mcode_list = [microcodes[m] for m in microcodes.keys()]
for mcode in mcode_list:
print '%-20s: model %s' % (mcode.name, mcode.model)
def FindMicrocode(microcodes, model):
"""Find all the microcode chunks which match the given model.
This model is something like 306a9 (the value returned in eax from
cpuid(1) when running on Intel CPUs). But we allow a partial match,
omitting the last 1 or two characters to allow many families to have the
same microcode.
If the model name is ambiguous we return a list of matches.
Args:
microcodes: Dict of Microcode objects indexed by name
model: String containing model name to find
Returns:
Tuple:
List of matching Microcode objects
List of abbreviations we tried
"""
# Allow a full name to be used
mcode = microcodes.get(model)
if mcode:
return [mcode], []
tried = []
found = []
for i in range(3):
abbrev = model[:-i] if i else model
tried.append(abbrev)
for mcode in microcodes.values():
if mcode.model.startswith(abbrev):
found.append(mcode)
if found:
break
return found, tried
def CreateFile(date, license_text, mcode, outfile):
"""Create a microcode file in U-Boot's .dtsi format
Args:
date: String containing date of original microcode file
license: List of text lines for the license file
mcode: Microcode object to write
outfile: Filename to write to ('-' for stdout)
"""
out = '''/*%s
* ---
* This is a device tree fragment. Use #include to add these properties to a
* node.
*
* Date: %s
*/
compatible = "intel,microcode";
intel,header-version = <%d>;
intel,update-revision = <%#x>;
intel,date-code = <%#x>;
intel,processor-signature = <%#x>;
intel,checksum = <%#x>;
intel,loader-revision = <%d>;
intel,processor-flags = <%#x>;
/* The first 48-bytes are the public header which repeats the above data */
data = <%s
\t>;'''
words = ''
for i in range(len(mcode.words)):
if not (i & 3):
words += '\n'
val = mcode.words[i]
# Change each word so it will be little-endian in the FDT
# This data is needed before RAM is available on some platforms so we
# cannot do an endianness swap on boot.
val = struct.unpack("<I", struct.pack(">I", val))[0]
words += '\t%#010x' % val
# Take care to avoid adding a space before a tab
text = ''
for line in license_text:
if line[0] == '\t':
text += '\n *' + line
else:
text += '\n * ' + line
args = [text, date]
args += [mcode.words[i] for i in range(7)]
args.append(words)
if outfile == '-':
print out % tuple(args)
else:
if not outfile:
if not os.path.exists(MICROCODE_DIR):
print >> sys.stderr, "Creating directory '%s'" % MICROCODE_DIR
os.makedirs(MICROCODE_DIR)
outfile = os.path.join(MICROCODE_DIR, mcode.name + '.dtsi')
print >> sys.stderr, "Writing microcode for '%s' to '%s'" % (
mcode.name, outfile)
with open(outfile, 'w') as fd:
print >> fd, out % tuple(args)
def MicrocodeTool():
"""Run the microcode tool"""
commands = 'create,license,list'.split(',')
parser = OptionParser()
parser.add_option('-d', '--mcfile', type='string', action='store',
help='Name of microcode.dat file')
parser.add_option('-m', '--model', type='string', action='store',
help='Model name to extract')
parser.add_option('-o', '--outfile', type='string', action='store',
help='Filename to use for output (- for stdout), default is'
' %s/<name>.dtsi' % MICROCODE_DIR)
parser.usage += """ command
Process an Intel microcode file (use -h for help). Commands:
create Create microcode .dtsi file for a model
list List available models in microcode file
license Print the license
Typical usage:
./tools/microcode-tool -d microcode.dat -m 306a create
This will find the appropriate file and write it to %s.""" % MICROCODE_DIR
(options, args) = parser.parse_args()
if not args:
parser.error('Please specify a command')
cmd = args[0]
if cmd not in commands:
parser.error("Unknown command '%s'" % cmd)
if not options.mcfile:
parser.error('You must specify a microcode file')
date, license_text, microcodes = ParseFile(options.mcfile)
if cmd == 'list':
List(date, microcodes, options.model)
elif cmd == 'license':
print '\n'.join(license_text)
elif cmd == 'create':
if not options.model:
parser.error('You must specify a model to create')
model = options.model.lower()
mcode_list, tried = FindMicrocode(microcodes, model)
if not mcode_list:
parser.error("Unknown model '%s' (%s) - try 'list' to list" %
(model, ', '.join(tried)))
if len(mcode_list) > 1:
parser.error("Ambiguous model '%s' (%s) matched %s - try 'list' "
"to list or specify a particular file" %
(model, ', '.join(tried),
', '.join([m.name for m in mcode_list])))
CreateFile(date, license_text, mcode_list[0], options.outfile)
else:
parser.error("Unknown command '%s'" % cmd)
if __name__ == "__main__":
MicrocodeTool()