mirror of
https://github.com/LongSoft/UEFITool.git
synced 2024-10-18 12:40:32 -04:00
163 lines
4.4 KiB
Text
163 lines
4.4 KiB
Text
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meta:
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id: ami_nvar
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title: AMI Aptio NVRAM Storage
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application: AMI Aptio-based UEFI firmware
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file-extension: nvar
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tags:
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- firmware
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license: CC0-1.0
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ks-version: 0.9
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endian: le
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seq:
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- id: entries
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type: nvar_entry
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repeat: until
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repeat-until: _.signature_first != 0x4e or _io.eof
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types:
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nvar_entry:
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seq:
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- id: invoke_offset
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size: 0
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if: offset >= 0
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- id: signature_first
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type: u1
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- id: signature_rest
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contents: [VAR]
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if: signature_first == 0x4e
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- id: size
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type: u2
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valid:
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expr: _ > sizeof<u4> + sizeof<u2> + sizeof<u4>
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if: signature_first == 0x4e
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- id: next
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type: b24le
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if: signature_first == 0x4e
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- id: attributes
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type: nvar_attributes
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if: signature_first == 0x4e
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- id: body
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type: nvar_entry_body
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size: size - (sizeof<u4> + sizeof<u2> + sizeof<u4>)
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if: signature_first == 0x4e
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- id: invoke_end_offset
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size: 0
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if: signature_first == 0x4e and end_offset >= 0
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instances:
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offset:
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value: _io.pos
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end_offset:
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value: _io.pos
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nvar_attributes:
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seq:
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- id: valid
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type: b1
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- id: auth_write
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type: b1
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- id: hw_error_record
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type: b1
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- id: extended_header
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type: b1
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- id: data_only
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type: b1
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- id: local_guid
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type: b1
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- id: ascii_name
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type: b1
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- id: runtime
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type: b1
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nvar_extended_attributes:
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seq:
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- id: reserved_high
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type: b2
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- id: time_based_auth
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type: b1
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- id: auth_write
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type: b1
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- id: reserved_low
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type: b3
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- id: checksum
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type: b1
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ucs2_string:
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seq:
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- id: ucs2_chars
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type: u2
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repeat: until
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repeat-until: _ == 0
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nvar_entry_body:
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seq:
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- id: guid_index
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type: u1
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if: (not _parent.attributes.local_guid)
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and (not _parent.attributes.data_only)
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and (_parent.attributes.valid)
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- id: guid
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size: 16
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if: (_parent.attributes.local_guid)
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and (not _parent.attributes.data_only)
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and (_parent.attributes.valid)
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- id: ascii_name
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type: strz
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encoding: ASCII
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if: (_parent.attributes.ascii_name)
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and (not _parent.attributes.data_only)
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and (_parent.attributes.valid)
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- id: ucs2_name
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type: ucs2_string
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if: (not _parent.attributes.ascii_name)
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and (not _parent.attributes.data_only)
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and (_parent.attributes.valid)
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- id: invoke_data_start
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size: 0
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if: data_start_offset >= 0
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- id: data
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size-eos: true
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instances:
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extended_header_size_field:
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pos: _io.pos - sizeof<u2>
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type: u2
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if: _parent.attributes.valid
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and _parent.attributes.extended_header
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and _parent.size > sizeof<u4> + sizeof<u2> + sizeof<u4> + sizeof<u2>
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extended_header_size:
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value: '_parent.attributes.extended_header ? (extended_header_size_field >= sizeof<nvar_extended_attributes> + sizeof<u2> ? extended_header_size_field : 0) : 0'
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extended_header_attributes:
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pos: _io.pos - extended_header_size
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type: nvar_extended_attributes
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if: _parent.attributes.valid
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and _parent.attributes.extended_header
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and (extended_header_size >= sizeof<nvar_extended_attributes> + sizeof<u2>)
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extended_header_timestamp:
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pos: _io.pos - extended_header_size + sizeof<nvar_extended_attributes>
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type: u8
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if: _parent.attributes.valid
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and _parent.attributes.extended_header
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and (extended_header_size >= sizeof<nvar_extended_attributes> + sizeof<u8> + sizeof<u2>)
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and extended_header_attributes.time_based_auth
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extended_header_hash:
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pos: _io.pos - extended_header_size + sizeof<nvar_extended_attributes> + sizeof<u8>
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size: 32
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if: _parent.attributes.valid
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and _parent.attributes.extended_header
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and (extended_header_size >= sizeof<nvar_extended_attributes> + sizeof<u8> + 32 + sizeof<u2>)
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and extended_header_attributes.time_based_auth
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and (not _parent.attributes.data_only)
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extended_header_checksum:
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pos: _io.pos - sizeof<u2> - sizeof<u1>
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type: u1
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if: _parent.attributes.valid
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and _parent.attributes.extended_header
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and (extended_header_size >= sizeof<nvar_extended_attributes> + sizeof<u1> + sizeof<u2>)
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and extended_header_attributes.checksum
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data_start_offset:
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value: _io.pos
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data_end_offset:
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value: _io.pos
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data_size:
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value: (data_end_offset - data_start_offset) - extended_header_size
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