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/*
* Copyright (C) 2013, Intel Corporation
* Copyright (C) 2014, Bin Meng <bmeng.cn@gmail.com>
*
* SPDX-License-Identifier: Intel
*/
#ifndef __FSP_FFS_H__
#define __FSP_FFS_H__
/* Used to verify the integrity of the file */
union __packed ffs_integrity {
struct {
/*
* The IntegrityCheck.checksum.header field is an 8-bit
* checksum of the file header. The State and
* IntegrityCheck.checksum.file fields are assumed to be zero
* and the checksum is calculated such that the entire header
* sums to zero.
*/
u8 header;
/*
* If the FFS_ATTRIB_CHECKSUM (see definition below) bit of
* the Attributes field is set to one, the
* IntegrityCheck.checksum.file field is an 8-bit checksum of
* the file data. If the FFS_ATTRIB_CHECKSUM bit of the
* Attributes field is cleared to zero, the
* IntegrityCheck.checksum.file field must be initialized with
* a value of 0xAA. The IntegrityCheck.checksum.file field is
* valid any time the EFI_FILE_DATA_VALID bit is set in the
* State field.
*/
u8 file;
} checksum;
/* This is the full 16 bits of the IntegrityCheck field */
u16 checksum16;
};
/*
* Each file begins with the header that describe the
* contents and state of the files.
*/
struct __packed ffs_file_header {
/*
* This GUID is the file name.
* It is used to uniquely identify the file.
*/
struct efi_guid name;
/* Used to verify the integrity of the file */
union ffs_integrity integrity;
/* Identifies the type of file */
u8 type;
/* Declares various file attribute bits */
u8 attr;
/* The length of the file in bytes, including the FFS header */
u8 size[3];
/*
* Used to track the state of the file throughout the life of
* the file from creation to deletion.
*/
u8 state;
};
struct __packed ffs_file_header2 {
/*
* This GUID is the file name. It is used to uniquely identify the file.
* There may be only one instance of a file with the file name GUID of
* Name in any given firmware volume, except if the file type is
* EFI_FV_FILE_TYPE_FFS_PAD.
*/
struct efi_guid name;
/* Used to verify the integrity of the file */
union ffs_integrity integrity;
/* Identifies the type of file */
u8 type;
/* Declares various file attribute bits */
u8 attr;
/*
* The length of the file in bytes, including the FFS header.
* The length of the file data is either
* (size - sizeof(struct ffs_file_header)). This calculation means a
* zero-length file has a size of 24 bytes, which is
* sizeof(struct ffs_file_header). Size is not required to be a
* multiple of 8 bytes. Given a file F, the next file header is located
* at the next 8-byte aligned firmware volume offset following the last
* byte of the file F.
*/
u8 size[3];
/*
* Used to track the state of the file throughout the life of
* the file from creation to deletion.
*/
u8 state;
/*
* If FFS_ATTRIB_LARGE_FILE is set in attr, then ext_size exists
* and size must be set to zero.
* If FFS_ATTRIB_LARGE_FILE is not set then
* struct ffs_file_header is used.
*/
u32 ext_size;
};
/*
* Pseudo type. It is used as a wild card when retrieving sections.
* The section type EFI_SECTION_ALL matches all section types.
*/
#define EFI_SECTION_ALL 0x00
/* Encapsulation section Type values */
#define EFI_SECTION_COMPRESSION 0x01
#define EFI_SECTION_GUID_DEFINED 0x02
#define EFI_SECTION_DISPOSABLE 0x03
/* Leaf section Type values */
#define EFI_SECTION_PE32 0x10
#define EFI_SECTION_PIC 0x11
#define EFI_SECTION_TE 0x12
#define EFI_SECTION_DXE_DEPEX 0x13
#define EFI_SECTION_VERSION 0x14
#define EFI_SECTION_USER_INTERFACE 0x15
#define EFI_SECTION_COMPATIBILITY16 0x16
#define EFI_SECTION_FIRMWARE_VOLUME_IMAGE 0x17
#define EFI_SECTION_FREEFORM_SUBTYPE_GUID 0x18
#define EFI_SECTION_RAW 0x19
#define EFI_SECTION_PEI_DEPEX 0x1B
#define EFI_SECTION_SMM_DEPEX 0x1C
/* Common section header */
struct __packed raw_section {
/*
* A 24-bit unsigned integer that contains the total size of
* the section in bytes, including the EFI_COMMON_SECTION_HEADER.
*/
u8 size[3];
u8 type;
};
struct __packed raw_section2 {
/*
* A 24-bit unsigned integer that contains the total size of
* the section in bytes, including the EFI_COMMON_SECTION_HEADER.
*/
u8 size[3];
u8 type;
/*
* If size is 0xFFFFFF, then ext_size contains the size of
* the section. If size is not equal to 0xFFFFFF, then this
* field does not exist.
*/
u32 ext_size;
};
#endif
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