mirror of
https://github.com/LongSoft/UEFITool.git
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101 lines
1.9 KiB
Plaintext
101 lines
1.9 KiB
Plaintext
meta:
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id: edk2_vss
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title: EDK2 VSS storage
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application: EDK2-based UEFI firmware
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file-extension: vss
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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: signature
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type: u4
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valid:
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expr: _ == 0x53535624 or _ == 0x53565324 or _ == 0x53534E24 # $VSS/$SVS/$NSS
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- id: size
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type: u4
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valid:
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expr: _ > 4 * sizeof<u4>
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- id: format
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type: u1
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valid:
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expr: _ == 0x5a # Formatted
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- id: state
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type: u1
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- id: reserved
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type: u2
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- id: reserved1
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type: u4
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- id: body
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type: vss_store_body
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size: size - 4 * sizeof<u4>
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types:
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vss_store_body:
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seq:
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- id: variables
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type: vss_variable
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repeat: until
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repeat-until: _.signature_first != 0xAA or _io.eof
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vss_variable_attributes:
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seq:
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- id: non_volatile
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type: b1le
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- id: boot_service
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type: b1le
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- id: runtime
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type: b1le
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- id: hw_error_record
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type: b1le
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- id: auth_write
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type: b1le
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- id: time_based_auth
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type: b1le
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- id: append_write
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type: b1le
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- id: reserved
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type: b24le
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- id: apple_data_checksum
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type: b1le
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vss_variable:
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seq:
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- id: signature_first
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type: u1
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- id: signature_last
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type: u1
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valid:
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expr: _ == 0x55
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if: signature_first == 0xAA
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- id: state
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type: u1
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if: signature_first == 0xAA
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- id: reserved
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type: u1
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if: signature_first == 0xAA
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- id: attributes
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type: vss_variable_attributes
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if: signature_first == 0xAA
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#TODO: add Intel legacy total_size variant
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- id: len_name
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type: u4
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if: signature_first == 0xAA
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- id: len_data
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type: u4
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if: signature_first == 0xAA
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- id: vendor_guid
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size: 16
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if: signature_first == 0xAA
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- id: apple_data_crc32
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type: u4
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if: signature_first == 0xAA and attributes.apple_data_checksum
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- id: name
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size: len_name
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if: signature_first == 0xAA
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- id: data
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size: len_data
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if: signature_first == 0xAA
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