mirror of
https://github.com/LongSoft/UEFITool.git
synced 2024-11-24 00:48:23 +08:00
163 lines
4.4 KiB
Plaintext
163 lines
4.4 KiB
Plaintext
meta:
|
|
id: ami_nvar
|
|
title: AMI Aptio NVRAM Storage
|
|
application: AMI Aptio-based UEFI firmware
|
|
file-extension: nvar
|
|
tags:
|
|
- firmware
|
|
license: CC0-1.0
|
|
ks-version: 0.9
|
|
endian: le
|
|
|
|
seq:
|
|
- id: entries
|
|
type: nvar_entry
|
|
repeat: until
|
|
repeat-until: _.signature_first != 0x4e or _io.eof
|
|
|
|
types:
|
|
nvar_entry:
|
|
seq:
|
|
- id: invoke_offset
|
|
size: 0
|
|
if: offset >= 0
|
|
- id: signature_first
|
|
type: u1
|
|
- id: signature_rest
|
|
contents: [VAR]
|
|
if: signature_first == 0x4e
|
|
- id: size
|
|
type: u2
|
|
valid:
|
|
expr: _ > sizeof<u4> + sizeof<u2> + sizeof<u4>
|
|
if: signature_first == 0x4e
|
|
- id: next
|
|
type: b24le
|
|
if: signature_first == 0x4e
|
|
- id: attributes
|
|
type: nvar_attributes
|
|
if: signature_first == 0x4e
|
|
- id: body
|
|
type: nvar_entry_body
|
|
size: size - (sizeof<u4> + sizeof<u2> + sizeof<u4>)
|
|
if: signature_first == 0x4e
|
|
- id: invoke_end_offset
|
|
size: 0
|
|
if: signature_first == 0x4e and end_offset >= 0
|
|
instances:
|
|
offset:
|
|
value: _io.pos
|
|
end_offset:
|
|
value: _io.pos
|
|
|
|
nvar_attributes:
|
|
seq:
|
|
- id: valid
|
|
type: b1
|
|
- id: auth_write
|
|
type: b1
|
|
- id: hw_error_record
|
|
type: b1
|
|
- id: extended_header
|
|
type: b1
|
|
- id: data_only
|
|
type: b1
|
|
- id: local_guid
|
|
type: b1
|
|
- id: ascii_name
|
|
type: b1
|
|
- id: runtime
|
|
type: b1
|
|
|
|
nvar_extended_attributes:
|
|
seq:
|
|
- id: reserved_high
|
|
type: b2
|
|
- id: time_based_auth
|
|
type: b1
|
|
- id: auth_write
|
|
type: b1
|
|
- id: reserved_low
|
|
type: b3
|
|
- id: checksum
|
|
type: b1
|
|
|
|
ucs2_string:
|
|
seq:
|
|
- id: ucs2_chars
|
|
type: u2
|
|
repeat: until
|
|
repeat-until: _ == 0
|
|
|
|
nvar_entry_body:
|
|
seq:
|
|
- id: guid_index
|
|
type: u1
|
|
if: (not _parent.attributes.local_guid)
|
|
and (not _parent.attributes.data_only)
|
|
and (_parent.attributes.valid)
|
|
- id: guid
|
|
size: 16
|
|
if: (_parent.attributes.local_guid)
|
|
and (not _parent.attributes.data_only)
|
|
and (_parent.attributes.valid)
|
|
- id: ascii_name
|
|
type: strz
|
|
encoding: ASCII
|
|
if: (_parent.attributes.ascii_name)
|
|
and (not _parent.attributes.data_only)
|
|
and (_parent.attributes.valid)
|
|
- id: ucs2_name
|
|
type: ucs2_string
|
|
if: (not _parent.attributes.ascii_name)
|
|
and (not _parent.attributes.data_only)
|
|
and (_parent.attributes.valid)
|
|
- id: invoke_data_start
|
|
size: 0
|
|
if: data_start_offset >= 0
|
|
- id: data
|
|
size-eos: true
|
|
instances:
|
|
extended_header_size_field:
|
|
pos: _io.pos - sizeof<u2>
|
|
type: u2
|
|
if: _parent.attributes.valid
|
|
and _parent.attributes.extended_header
|
|
and _parent.size > sizeof<u4> + sizeof<u2> + sizeof<u4> + sizeof<u2>
|
|
extended_header_size:
|
|
value: '_parent.attributes.extended_header ? (extended_header_size_field >= sizeof<nvar_extended_attributes> + sizeof<u2> ? extended_header_size_field : 0) : 0'
|
|
extended_header_attributes:
|
|
pos: _io.pos - extended_header_size
|
|
type: nvar_extended_attributes
|
|
if: _parent.attributes.valid
|
|
and _parent.attributes.extended_header
|
|
and (extended_header_size >= sizeof<nvar_extended_attributes> + sizeof<u2>)
|
|
extended_header_timestamp:
|
|
pos: _io.pos - extended_header_size + sizeof<nvar_extended_attributes>
|
|
type: u8
|
|
if: _parent.attributes.valid
|
|
and _parent.attributes.extended_header
|
|
and (extended_header_size >= sizeof<nvar_extended_attributes> + sizeof<u8> + sizeof<u2>)
|
|
and extended_header_attributes.time_based_auth
|
|
extended_header_hash:
|
|
pos: _io.pos - extended_header_size + sizeof<nvar_extended_attributes> + sizeof<u8>
|
|
size: 32
|
|
if: _parent.attributes.valid
|
|
and _parent.attributes.extended_header
|
|
and (extended_header_size >= sizeof<nvar_extended_attributes> + sizeof<u8> + 32 + sizeof<u2>)
|
|
and extended_header_attributes.time_based_auth
|
|
and (not _parent.attributes.data_only)
|
|
extended_header_checksum:
|
|
pos: _io.pos - sizeof<u2> - sizeof<u1>
|
|
type: u1
|
|
if: _parent.attributes.valid
|
|
and _parent.attributes.extended_header
|
|
and (extended_header_size >= sizeof<nvar_extended_attributes> + sizeof<u1> + sizeof<u2>)
|
|
and extended_header_attributes.checksum
|
|
data_start_offset:
|
|
value: _io.pos
|
|
data_end_offset:
|
|
value: _io.pos
|
|
data_size:
|
|
value: (data_end_offset - data_start_offset) - extended_header_size
|