1 /* SPDX-License-Identifier: Intel */
3 * Copyright (C) 2013, Intel Corporation
4 * Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com>
10 /* Used to verify the integrity of the file */
11 union __packed ffs_integrity {
14 * The IntegrityCheck.checksum.header field is an 8-bit
15 * checksum of the file header. The State and
16 * IntegrityCheck.checksum.file fields are assumed to be zero
17 * and the checksum is calculated such that the entire header
22 * If the FFS_ATTRIB_CHECKSUM (see definition below) bit of
23 * the Attributes field is set to one, the
24 * IntegrityCheck.checksum.file field is an 8-bit checksum of
25 * the file data. If the FFS_ATTRIB_CHECKSUM bit of the
26 * Attributes field is cleared to zero, the
27 * IntegrityCheck.checksum.file field must be initialized with
28 * a value of 0xAA. The IntegrityCheck.checksum.file field is
29 * valid any time the EFI_FILE_DATA_VALID bit is set in the
35 /* This is the full 16 bits of the IntegrityCheck field */
40 * Each file begins with the header that describe the
41 * contents and state of the files.
43 struct __packed ffs_file_header {
45 * This GUID is the file name.
46 * It is used to uniquely identify the file.
49 /* Used to verify the integrity of the file */
50 union ffs_integrity integrity;
51 /* Identifies the type of file */
53 /* Declares various file attribute bits */
55 /* The length of the file in bytes, including the FFS header */
58 * Used to track the state of the file throughout the life of
59 * the file from creation to deletion.
64 struct __packed ffs_file_header2 {
66 * This GUID is the file name. It is used to uniquely identify the file.
67 * There may be only one instance of a file with the file name GUID of
68 * Name in any given firmware volume, except if the file type is
69 * EFI_FV_FILE_TYPE_FFS_PAD.
72 /* Used to verify the integrity of the file */
73 union ffs_integrity integrity;
74 /* Identifies the type of file */
76 /* Declares various file attribute bits */
79 * The length of the file in bytes, including the FFS header.
80 * The length of the file data is either
81 * (size - sizeof(struct ffs_file_header)). This calculation means a
82 * zero-length file has a size of 24 bytes, which is
83 * sizeof(struct ffs_file_header). Size is not required to be a
84 * multiple of 8 bytes. Given a file F, the next file header is located
85 * at the next 8-byte aligned firmware volume offset following the last
90 * Used to track the state of the file throughout the life of
91 * the file from creation to deletion.
95 * If FFS_ATTRIB_LARGE_FILE is set in attr, then ext_size exists
96 * and size must be set to zero.
97 * If FFS_ATTRIB_LARGE_FILE is not set then
98 * struct ffs_file_header is used.
104 * Pseudo type. It is used as a wild card when retrieving sections.
105 * The section type EFI_SECTION_ALL matches all section types.
107 #define EFI_SECTION_ALL 0x00
109 /* Encapsulation section Type values */
110 #define EFI_SECTION_COMPRESSION 0x01
111 #define EFI_SECTION_GUID_DEFINED 0x02
112 #define EFI_SECTION_DISPOSABLE 0x03
114 /* Leaf section Type values */
115 #define EFI_SECTION_PE32 0x10
116 #define EFI_SECTION_PIC 0x11
117 #define EFI_SECTION_TE 0x12
118 #define EFI_SECTION_DXE_DEPEX 0x13
119 #define EFI_SECTION_VERSION 0x14
120 #define EFI_SECTION_USER_INTERFACE 0x15
121 #define EFI_SECTION_COMPATIBILITY16 0x16
122 #define EFI_SECTION_FIRMWARE_VOLUME_IMAGE 0x17
123 #define EFI_SECTION_FREEFORM_SUBTYPE_GUID 0x18
124 #define EFI_SECTION_RAW 0x19
125 #define EFI_SECTION_PEI_DEPEX 0x1B
126 #define EFI_SECTION_SMM_DEPEX 0x1C
128 /* Common section header */
129 struct __packed raw_section {
131 * A 24-bit unsigned integer that contains the total size of
132 * the section in bytes, including the EFI_COMMON_SECTION_HEADER.
138 struct __packed raw_section2 {
140 * A 24-bit unsigned integer that contains the total size of
141 * the section in bytes, including the EFI_COMMON_SECTION_HEADER.
146 * If size is 0xFFFFFF, then ext_size contains the size of
147 * the section. If size is not equal to 0xFFFFFF, then this
148 * field does not exist.