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efi_loader: add comment for efi_tcg2.h

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This commit adds the comment of the TCG Specification
efi_tcg2.h file refers, and comment for the structure.

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Masahisa Kojima 2021-08-13 16:12:43 +09:00 committed by Heinrich Schuchardt
parent 7075ef463e
commit 7685d17b72
1 changed files with 54 additions and 3 deletions
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57
include/efi_tcg2.h
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@ -3,6 +3,13 @@
* Defines data structures and APIs that allow an OS to interact with UEFI
* firmware to query information about the device
*
* This file refers the following TCG specification.
* - TCG PC Client Platform Firmware Profile Specification
* https://trustedcomputinggroup.org/resource/pc-client-specific-platform-firmware-profile-specification/
*
* - TCG EFI Protocol Specification
* https://trustedcomputinggroup.org/resource/tcg-efi-protocol-specification/
*
* Copyright (c) 2020, Linaro Limited
*/
@ -36,11 +43,23 @@ typedef u32 efi_tcg_event_log_bitmap;
typedef u32 efi_tcg_event_log_format;
typedef u32 efi_tcg_event_algorithm_bitmap;
/**
* struct tdEFI_TCG2_VERSION - structure of EFI TCG2 version
* @major: major version
* @minor: minor version
*/
struct efi_tcg2_version {
u8 major;
u8 minor;
};
/**
* struct tdEFI_TCG2_EVENT_HEADER - structure of EFI TCG2 event header
* @header_size: size of the event header
* @header_version: header version
* @pcr_index: index of the PCR that is extended
* @event_type: type of the event that is extended
*/
struct efi_tcg2_event_header {
u32 header_size;
u16 header_version;
@ -48,12 +67,27 @@ struct efi_tcg2_event_header {
u32 event_type;
} __packed;
/**
* struct tdEFI_TCG2_EVENT - structure of EFI TCG2 event
* @size: total size of the event including the size component, the header
* and the event data
* @header: event header
* @event: event to add
*/
struct efi_tcg2_event {
u32 size;
struct efi_tcg2_event_header header;
u8 event[];
} __packed;
/**
* struct tdUEFI_IMAGE_LOAD_EVENT - structure of PE/COFF image measurement
* @image_location_in_memory: image address
* @image_length_in_memory: image size
* @image_link_time_address: image link time address
* @length_of_device_path: devive path size
* @device_path: device path
*/
struct uefi_image_load_event {
efi_physical_addr_t image_location_in_memory;
u64 image_length_in_memory;
@ -62,6 +96,23 @@ struct uefi_image_load_event {
struct efi_device_path device_path[];
};
/**
* struct tdEFI_TCG2_BOOT_SERVICE_CAPABILITY - protocol capability information
* @size: allocated size of the structure
* @structure_version: version of this structure
* @protocol_version: version of the EFI TCG2 protocol.
* @hash_algorithm_bitmap: supported hash algorithms
* @supported_event_logs: bitmap of supported event log formats
* @tpm_present_flag: false = TPM not present
* @max_command_size: max size (in bytes) of a command
* that can be sent to the TPM
* @max_response_size: max size (in bytes) of a response that
* can be provided by the TPM
* @manufacturer_id: 4-byte Vendor ID
* @number_of_pcr_banks: maximum number of PCR banks
* @active_pcr_banks: bitmap of currently active
* PCR banks (hashing algorithms).
*/
struct efi_tcg2_boot_service_capability {
u8 size;
struct efi_tcg2_version structure_version;
@ -86,7 +137,7 @@ struct efi_tcg2_boot_service_capability {
#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_ERRATA_TPM2 2
/**
* struct TCG_EfiSpecIdEventAlgorithmSize
* struct TCG_EfiSpecIdEventAlgorithmSize - hashing algorithm information
*
* @algorithm_id: algorithm defined in enum tpm2_algorithms
* @digest_size: size of the algorithm
@ -97,7 +148,7 @@ struct tcg_efi_spec_id_event_algorithm_size {
} __packed;
/**
* struct TCG_EfiSpecIDEventStruct
* struct TCG_EfiSpecIDEventStruct - content of the event log header
*
* @signature: signature, set to Spec ID Event03
* @platform_class: class defined in TCG ACPI Specification
@ -130,7 +181,7 @@ struct tcg_efi_spec_id_event {
} __packed;
/**
* struct tdEFI_TCG2_FINAL_EVENTS_TABLE
* struct tdEFI_TCG2_FINAL_EVENTS_TABLE - log entries after Get Event Log
* @version: version number for this structure
* @number_of_events: number of events recorded after invocation of
* GetEventLog()