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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
317 lines
11 KiB
Python
Executable File
317 lines
11 KiB
Python
Executable File
#!/usr/bin/env python2
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# SPDX-License-Identifier: GPL-2.0+
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#
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# Copyright (c) 2014 Google, Inc
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#
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# Intel microcode update tool
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from optparse import OptionParser
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import os
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import re
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import struct
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import sys
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MICROCODE_DIR = 'arch/x86/dts/microcode'
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class Microcode:
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"""Holds information about the microcode for a particular model of CPU.
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Attributes:
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name: Name of the CPU this microcode is for, including any version
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information (e.g. 'm12206a7_00000029')
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model: Model code string (this is cpuid(1).eax, e.g. '206a7')
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words: List of hex words containing the microcode. The first 16 words
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are the public header.
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"""
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def __init__(self, name, data):
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self.name = name
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# Convert data into a list of hex words
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self.words = []
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for value in ''.join(data).split(','):
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hexval = value.strip()
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if hexval:
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self.words.append(int(hexval, 0))
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# The model is in the 4rd hex word
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self.model = '%x' % self.words[3]
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def ParseFile(fname):
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"""Parse a micrcode.dat file and return the component parts
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Args:
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fname: Filename to parse
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Returns:
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3-Tuple:
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date: String containing date from the file's header
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license_text: List of text lines for the license file
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microcodes: List of Microcode objects from the file
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"""
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re_date = re.compile('/\* *(.* [0-9]{4}) *\*/$')
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re_license = re.compile('/[^-*+] *(.*)$')
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re_name = re.compile('/\* *(.*)\.inc *\*/', re.IGNORECASE)
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microcodes = {}
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license_text = []
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date = ''
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data = []
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name = None
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with open(fname) as fd:
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for line in fd:
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line = line.rstrip()
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m_date = re_date.match(line)
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m_license = re_license.match(line)
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m_name = re_name.match(line)
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if m_name:
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if name:
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microcodes[name] = Microcode(name, data)
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name = m_name.group(1).lower()
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data = []
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elif m_license:
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license_text.append(m_license.group(1))
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elif m_date:
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date = m_date.group(1)
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else:
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data.append(line)
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if name:
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microcodes[name] = Microcode(name, data)
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return date, license_text, microcodes
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def ParseHeaderFiles(fname_list):
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"""Parse a list of header files and return the component parts
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Args:
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fname_list: List of files to parse
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Returns:
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date: String containing date from the file's header
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license_text: List of text lines for the license file
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microcodes: List of Microcode objects from the file
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"""
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microcodes = {}
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license_text = []
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date = ''
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name = None
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for fname in fname_list:
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name = os.path.basename(fname).lower()
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name = os.path.splitext(name)[0]
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data = []
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with open(fname) as fd:
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license_start = False
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license_end = False
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for line in fd:
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line = line.rstrip()
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if len(line) >= 2:
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if line[0] == '/' and line[1] == '*':
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license_start = True
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continue
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if line[0] == '*' and line[1] == '/':
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license_end = True
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continue
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if license_start and not license_end:
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# Ignore blank line
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if len(line) > 0:
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license_text.append(line)
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continue
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# Omit anything after the last comma
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words = line.split(',')[:-1]
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data += [word + ',' for word in words]
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microcodes[name] = Microcode(name, data)
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return date, license_text, microcodes
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def List(date, microcodes, model):
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"""List the available microcode chunks
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Args:
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date: Date of the microcode file
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microcodes: Dict of Microcode objects indexed by name
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model: Model string to search for, or None
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"""
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print 'Date: %s' % date
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if model:
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mcode_list, tried = FindMicrocode(microcodes, model.lower())
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print 'Matching models %s:' % (', '.join(tried))
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else:
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print 'All models:'
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mcode_list = [microcodes[m] for m in microcodes.keys()]
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for mcode in mcode_list:
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print '%-20s: model %s' % (mcode.name, mcode.model)
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def FindMicrocode(microcodes, model):
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"""Find all the microcode chunks which match the given model.
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This model is something like 306a9 (the value returned in eax from
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cpuid(1) when running on Intel CPUs). But we allow a partial match,
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omitting the last 1 or two characters to allow many families to have the
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same microcode.
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If the model name is ambiguous we return a list of matches.
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Args:
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microcodes: Dict of Microcode objects indexed by name
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model: String containing model name to find
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Returns:
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Tuple:
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List of matching Microcode objects
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List of abbreviations we tried
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"""
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# Allow a full name to be used
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mcode = microcodes.get(model)
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if mcode:
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return [mcode], []
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tried = []
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found = []
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for i in range(3):
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abbrev = model[:-i] if i else model
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tried.append(abbrev)
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for mcode in microcodes.values():
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if mcode.model.startswith(abbrev):
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found.append(mcode)
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if found:
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break
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return found, tried
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def CreateFile(date, license_text, mcodes, outfile):
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"""Create a microcode file in U-Boot's .dtsi format
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Args:
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date: String containing date of original microcode file
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license: List of text lines for the license file
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mcodes: Microcode objects to write (normally only 1)
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outfile: Filename to write to ('-' for stdout)
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"""
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out = '''/*%s
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* ---
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* This is a device tree fragment. Use #include to add these properties to a
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* node.
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*
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* Date: %s
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*/
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compatible = "intel,microcode";
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intel,header-version = <%d>;
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intel,update-revision = <%#x>;
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intel,date-code = <%#x>;
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intel,processor-signature = <%#x>;
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intel,checksum = <%#x>;
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intel,loader-revision = <%d>;
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intel,processor-flags = <%#x>;
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/* The first 48-bytes are the public header which repeats the above data */
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data = <%s
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\t>;'''
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words = ''
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add_comments = len(mcodes) > 1
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for mcode in mcodes:
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if add_comments:
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words += '\n/* %s */' % mcode.name
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for i in range(len(mcode.words)):
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if not (i & 3):
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words += '\n'
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val = mcode.words[i]
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# Change each word so it will be little-endian in the FDT
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# This data is needed before RAM is available on some platforms so
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# we cannot do an endianness swap on boot.
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val = struct.unpack("<I", struct.pack(">I", val))[0]
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words += '\t%#010x' % val
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# Use the first microcode for the headers
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mcode = mcodes[0]
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# Take care to avoid adding a space before a tab
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text = ''
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for line in license_text:
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if line[0] == '\t':
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text += '\n *' + line
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else:
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text += '\n * ' + line
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args = [text, date]
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args += [mcode.words[i] for i in range(7)]
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args.append(words)
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if outfile == '-':
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print out % tuple(args)
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else:
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if not outfile:
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if not os.path.exists(MICROCODE_DIR):
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print >> sys.stderr, "Creating directory '%s'" % MICROCODE_DIR
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os.makedirs(MICROCODE_DIR)
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outfile = os.path.join(MICROCODE_DIR, mcode.name + '.dtsi')
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print >> sys.stderr, "Writing microcode for '%s' to '%s'" % (
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', '.join([mcode.name for mcode in mcodes]), outfile)
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with open(outfile, 'w') as fd:
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print >> fd, out % tuple(args)
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def MicrocodeTool():
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"""Run the microcode tool"""
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commands = 'create,license,list'.split(',')
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parser = OptionParser()
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parser.add_option('-d', '--mcfile', type='string', action='store',
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help='Name of microcode.dat file')
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parser.add_option('-H', '--headerfile', type='string', action='append',
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help='Name of .h file containing microcode')
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parser.add_option('-m', '--model', type='string', action='store',
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help="Model name to extract ('all' for all)")
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parser.add_option('-M', '--multiple', type='string', action='store',
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help="Allow output of multiple models")
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parser.add_option('-o', '--outfile', type='string', action='store',
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help='Filename to use for output (- for stdout), default is'
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' %s/<name>.dtsi' % MICROCODE_DIR)
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parser.usage += """ command
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Process an Intel microcode file (use -h for help). Commands:
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create Create microcode .dtsi file for a model
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list List available models in microcode file
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license Print the license
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Typical usage:
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./tools/microcode-tool -d microcode.dat -m 306a create
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This will find the appropriate file and write it to %s.""" % MICROCODE_DIR
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(options, args) = parser.parse_args()
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if not args:
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parser.error('Please specify a command')
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cmd = args[0]
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if cmd not in commands:
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parser.error("Unknown command '%s'" % cmd)
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if (not not options.mcfile) != (not not options.mcfile):
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parser.error("You must specify either header files or a microcode file, not both")
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if options.headerfile:
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date, license_text, microcodes = ParseHeaderFiles(options.headerfile)
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elif options.mcfile:
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date, license_text, microcodes = ParseFile(options.mcfile)
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else:
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parser.error('You must specify a microcode file (or header files)')
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if cmd == 'list':
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List(date, microcodes, options.model)
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elif cmd == 'license':
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print '\n'.join(license_text)
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elif cmd == 'create':
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if not options.model:
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parser.error('You must specify a model to create')
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model = options.model.lower()
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if options.model == 'all':
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options.multiple = True
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mcode_list = microcodes.values()
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tried = []
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else:
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mcode_list, tried = FindMicrocode(microcodes, model)
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if not mcode_list:
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parser.error("Unknown model '%s' (%s) - try 'list' to list" %
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(model, ', '.join(tried)))
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if not options.multiple and len(mcode_list) > 1:
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parser.error("Ambiguous model '%s' (%s) matched %s - try 'list' "
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"to list or specify a particular file" %
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(model, ', '.join(tried),
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', '.join([m.name for m in mcode_list])))
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CreateFile(date, license_text, mcode_list, options.outfile)
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else:
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parser.error("Unknown command '%s'" % cmd)
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if __name__ == "__main__":
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MicrocodeTool()
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