[U-Boot] [PATCH v2 1/6] x86: Add a script to process Intel microcode files
Simon Glass
sjg at chromium.org
Tue Dec 16 06:02:37 CET 2014
Intel delivers microcode updates in a microcode.dat file which must be
split up into individual files for each CPU. Add a tool which performs
this task. It can list available microcode updates for each model and
produce a new microcode update in U-Boot's .dtsi format.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
Changes in v2:
- Add function comments
- Fix problem with specifying the full microcode filename
- Allow 'list' command to display a list of matching microcode chunks
- Print a message when generating microcode
- Expand the help a little
- Print an error when an ambiguous microcode model is given
tools/microcode-tool | 1 +
tools/microcode-tool.py | 245 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 246 insertions(+)
create mode 120000 tools/microcode-tool
create mode 100755 tools/microcode-tool.py
diff --git a/tools/microcode-tool b/tools/microcode-tool
new file mode 120000
index 0000000..8be8507
--- /dev/null
+++ b/tools/microcode-tool
@@ -0,0 +1 @@
+microcode-tool.py
\ No newline at end of file
diff --git a/tools/microcode-tool.py b/tools/microcode-tool.py
new file mode 100755
index 0000000..5dbb0db
--- /dev/null
+++ b/tools/microcode-tool.py
@@ -0,0 +1,245 @@
+#!/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: 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 = []
+ 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.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, 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, 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.
+ */
+
+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:
+ if line[0] == '\t':
+ text += '\n *' + line
+ else:
+ text += '\n * ' + line
+ args = [text]
+ args += [mcode.words[i] for i in range(7)]
+ args.append(words)
+ if outfile == '-':
+ print out % tuple(args)
+ else:
+ if not outfile:
+ outfile = os.path.join(MICROCODE_DIR, mcode.name + '.dtsi')
+ print >>sys.stderr, "Writing micrcode for '%s' to '%s'" % (
+ mcode.name, outfile)
+ with open(outfile, 'w') as fd:
+ print >>fd, out % tuple(args)
+
+
+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, microcodes = ParseFile(options.mcfile)
+
+if cmd == 'list':
+ List(date, microcodes, options.model)
+elif cmd == 'license':
+ print '\n'.join(license)
+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, mcode_list[0], options.outfile)
+else:
+ parser.error("Unknown command '%s'" % cmd)
--
2.2.0.rc0.207.ga3a616c
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