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https://github.com/86Box/bios-tools.git
synced 2026-02-24 10:28:20 -07:00
Figured out the AMI pre-Color string encoding
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RichardG867
@@ -83,13 +83,12 @@ python3 -m biostools -a roms/0 | tee bioslist.csv
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### AMI
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* **Pre-Color** (1990 and older) BIOSes have a dynamically-generated string that is not easily extractable; the analyzer will attempt to reconstruct it around the limited data contained in the ROM in a best-effort basis.
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* The string on **UEFI** is a hidden string located within the AMIBIOS 8-based Compatibility Support Module (CSM). A missing string may indicate a lack of CSM.
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* The string on **UEFI** is a hidden string located within the AMIBIOS 8-based Compatibility Support Module (CSM). A missing string may indicate a missing CSM.
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### Award
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* The core version can be followed by `(Phoenix)` on BIOSes which identify as **Phoenix AwardBIOS**, or `(Workstation)` on ones which identify as **Award WorkstationBIOS**.
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* OEM modifications which interfere with detection: **Sukjung** (string)
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* OEM modifications which may interfere with detection: **Sukjung** (string)
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### IBM
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@@ -332,9 +332,7 @@ class AMIAnalyzer(Analyzer):
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self._precolor_block_pattern = re.compile(b'''\(C\)(?:[0-9]{4}(?:AMI,404-263-8181|TGem-HCS,PSC,JGS)|( Access Methods Inc\.))''')
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# "Date:-" might not have a space after it (Intel AMI)
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self._precolor_date_pattern = re.compile(b'''(?:(?: Date:- ?|AMI- )[0-9]{2}/[0-9]{2}/[0-9]{2}|DDaattee(?:::| )--(?: )?([0-9])\\1([0-9])\\2//([0-9])\\3([0-9])\\4//([0-9])\\5([0-9])\\6)''')
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# "286/386/386sx/486-BIOS" are known ("386sx" = TriGem), others are what-if
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self._precolor_chipset_pattern = re.compile(b'''(SETUP PROGRAM FOR [\\x20-\\x7E]+)|(EMI 386 CHIPSET SETUP UTILITY)|(VLSI BIOS, 286 CHIPSET)|(CHIP & TECH SETUP PROGRAM)|( 286 BIOS)|(386 BIOS, NO CHIPSET)|([0-9]86(?:[DdSs][Xx]|[Ss][Ll][Cc]?)?-BIOS \(C\))''')
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self._precolor_extsetup_pattern = re.compile(b'''EXTENDED (?:CMOS )?SETUP PROGRAM''')
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self._precolor_string_pattern = re.compile(b'''\\xFE{4}((?:[\\x00-\\xFF]{4}\\x96){2}[\\x00-\\xFF]{6})''')
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self._precolor_signon_pattern = re.compile(b'''BIOS \(C\).*(?:AMI|American Megatrends Inc), for ([\\x0D\\x0A\\x20-\\x7E]+)''')
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self.register_check_list([
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@@ -420,90 +418,29 @@ class AMIAnalyzer(Analyzer):
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# Access Methods doesn't have the setup type and chipset.
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if not match.group(1):
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# Reconstruct string, starting with the setup type.
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if b'ROM DIAGNOSTICS.(C)' in file_data:
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self.string = 'D'
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elif self._precolor_extsetup_pattern.search(file_data):
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self.string = 'E'
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else:
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self.string = 'S'
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# Add chipset. Known undetectable codes due
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# to a lack of BIOS images or marker strings:
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# - 307 (C&T CS8236)
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# - GS2 (GoldStar)
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# - INT (Intel 82335)
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# - PAQ (Compaq)
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# - S24 (??? Morse KP286)
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# - SUN (Suntac)
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# - VLX (VLSI 386?)
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chipset = '???'
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match = self._precolor_chipset_pattern.search(file_data)
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# Locate the encoded string.
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match = self._precolor_string_pattern.search(file_data)
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if match:
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setup_program_for = match.group(1) # "SETUP PROGRAM FOR"
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if setup_program_for:
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#if b' C&T ' in setup_program_for: # not necessary with fallback below
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# chipset = 'C&T'
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if b' INTEL 386 ' in setup_program_for:
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chipset = '343'
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elif b' NEAT ' in setup_program_for:
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if b'NEATsx Memory Controller Identifier' in file_data:
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chipset = 'NSX'
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else:
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chipset = 'NET'
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elif b' OPTI ' in setup_program_for:
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chipset = 'OPB'
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elif b' SCAT ' in setup_program_for:
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chipset = 'SC2'
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elif b' SIS ' in setup_program_for:
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chipset = 'SIS'
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else:
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# Your guess is as good as mine.
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chipset = setup_program_for[18:21].decode('cp437', 'ignore')
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if chipset != 'C&T':
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self.signon = 'DEBUG:UnknownSetup:' + setup_program_for.decode('cp437', 'ignore')
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else:
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bios_id_index = match.start(5) # " 286 BIOS"
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if bios_id_index > -1:
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bios_id = file_data[bios_id_index - 10:bios_id_index + 1]
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if b'ACER 1207 ' in bios_id:
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chipset = 'AR2'
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elif b'HT-11 ' in bios_id:
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chipset = 'H12'
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elif b'HT-1X ' in bios_id:
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chipset = 'H1X'
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elif b'NEAT ' in bios_id: # assumed; not bootable on 86Box
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chipset = 'NET'
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elif b'SCAT ' in bios_id:
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chipset = 'SC2'
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elif b'WIN ' in bios_id: # Winbond; not bootable on 86Box, source is a MAME comment
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chipset = '286'
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else:
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self.signon = 'DEBUG:UnknownChipset:' + bios_id.decode('cp437', 'ignore')
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elif match.group(2): # "EMI 386 CHIPSET SETUP UTILITY"
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chipset = 'EMI'
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elif match.group(3): # "VLSI BIOS, 286 CHIPSET"
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chipset = 'VL2'
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elif match.group(4): # "CHIP & TECH SETUP PROGRAM"
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chipset = 'C&T'
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elif match.group(6): # "386 BIOS, NO CHIPSET"
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chipset = 'INT'
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else:
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x86_bios = match.group(7) # "[234]86-BIOS (C)"
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if x86_bios:
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chipset = x86_bios[:3].decode('cp437', 'ignore')
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self.string += chipset + '-'
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# Extract string.
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self.string = ''
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for c in match.group(1):
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c = ~c & 0xff
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c = ((c << 5) | (c >> 3)) & 0xff
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self.string += chr(c)
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return True
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else:
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# Fallback if we can't find the encoded string.
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self.string = '????-'
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# Add vendor ID.
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self.string += codecs.encode(file_data[id_block_index - 0xbb:id_block_index - 0xb9], 'hex').decode('ascii', 'ignore').upper()
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# Add date. Use the entry point date instead of the identification block one, as it
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# appears the entry point one is displayed on screen. (Shuttle 386SX, TriGem 486-BIOS)
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# Add date.
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self.string += '-' + util.read_string(file_data[id_block_index + 0x9c:id_block_index + 0xa4]).replace('/', '').strip()
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# Invalidate string if the identification block
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# doesn't appear to be valid. (Intel AMI post-Color)
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if self.string[:10] in ('S???-0000-', 'S???-0166-') and file_data[id_block_index - 0xb9:id_block_index - 0xb7] != b'\x00\x01':
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# Invalidate string if the identification block doesn't
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# appear to be valid. (Intel AMI post-Color without string)
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if self.string[:10] in ('????-0000-', '????-0166-'):
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self.string = ''
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return True
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elif check_match.group(1): # 8088-BIOS header
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