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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* 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
*/
#if !defined _EFI_TCG2_PROTOCOL_H_
#define _EFI_TCG2_PROTOCOL_H_
#include <efi_api.h>
#include <tpm-v2.h>
#define EFI_TCG2_PROTOCOL_GUID \
EFI_GUID(0x607f766c, 0x7455, 0x42be, 0x93, \
0x0b, 0xe4, 0xd7, 0x6d, 0xb2, 0x72, 0x0f)
/* TPMV2 only */
#define TCG2_EVENT_LOG_FORMAT_TCG_2 0x00000002
#define EFI_TCG2_EXTEND_ONLY 0x0000000000000001
#define PE_COFF_IMAGE 0x0000000000000010
#define EFI_TCG2_MAX_PCR_INDEX 23
/* Algorithm Registry */
#define EFI_TCG2_BOOT_HASH_ALG_SHA1 0x00000001
#define EFI_TCG2_BOOT_HASH_ALG_SHA256 0x00000002
#define EFI_TCG2_BOOT_HASH_ALG_SHA384 0x00000004
#define EFI_TCG2_BOOT_HASH_ALG_SHA512 0x00000008
#define EFI_TCG2_BOOT_HASH_ALG_SM3_256 0x00000010
#define EFI_TCG2_FINAL_EVENTS_TABLE_VERSION 1
#define TPM2_EVENT_LOG_SIZE CONFIG_EFI_TCG2_PROTOCOL_EVENTLOG_SIZE
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;
u32 pcr_index;
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;
u64 image_link_time_address;
u64 length_of_device_path;
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;
struct efi_tcg2_version protocol_version;
efi_tcg_event_algorithm_bitmap hash_algorithm_bitmap;
efi_tcg_event_log_bitmap supported_event_logs;
u8 tpm_present_flag;
u16 max_command_size;
u16 max_response_size;
u32 manufacturer_id;
u32 number_of_pcr_banks;
efi_tcg_event_algorithm_bitmap active_pcr_banks;
};
/* up to and including the vendor ID (manufacturer_id) field */
#define BOOT_SERVICE_CAPABILITY_MIN \
offsetof(struct efi_tcg2_boot_service_capability, number_of_pcr_banks)
#define TCG_EFI_SPEC_ID_EVENT_SIGNATURE_03 "Spec ID Event03"
#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MAJOR_TPM2 2
#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_MINOR_TPM2 0
#define TCG_EFI_SPEC_ID_EVENT_SPEC_VERSION_ERRATA_TPM2 2
/**
* struct TCG_EfiSpecIdEventAlgorithmSize - hashing algorithm information
*
* @algorithm_id: algorithm defined in enum tpm2_algorithms
* @digest_size: size of the algorithm
*/
struct tcg_efi_spec_id_event_algorithm_size {
u16 algorithm_id;
u16 digest_size;
} __packed;
/**
* struct TCG_EfiSpecIDEventStruct - content of the event log header
*
* @signature: signature, set to Spec ID Event03
* @platform_class: class defined in TCG ACPI Specification
* Client Common Header.
* @spec_version_minor: minor version
* @spec_version_major: major version
* @spec_version_errata: major version
* @uintn_size: size of the efi_uintn_t fields used in various
* data structures used in this specification.
* 0x01 indicates u32 and 0x02 indicates u64
* @number_of_algorithms: hashing algorithms used in this event log
* @digest_sizes: array of number_of_algorithms pairs
* 1st member defines the algorithm id
* 2nd member defines the algorithm size
*/
struct tcg_efi_spec_id_event {
u8 signature[16];
u32 platform_class;
u8 spec_version_minor;
u8 spec_version_major;
u8 spec_errata;
u8 uintn_size;
u32 number_of_algorithms;
struct tcg_efi_spec_id_event_algorithm_size digest_sizes[];
} __packed;
/**
* 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()
* @event: List of events of type tcg_pcr_event2
*/
struct efi_tcg2_final_events_table {
u64 version;
u64 number_of_events;
struct tcg_pcr_event2 event[];
};
/**
* struct tdUEFI_VARIABLE_DATA - event log structure of UEFI variable
* @variable_name: The vendorGUID parameter in the
* GetVariable() API.
* @unicode_name_length: The length in CHAR16 of the Unicode name of
* the variable.
* @variable_data_length: The size of the variable data.
* @unicode_name: The CHAR16 unicode name of the variable
* without NULL-terminator.
* @variable_data: The data parameter of the efi variable
* in the GetVariable() API.
*/
struct efi_tcg2_uefi_variable_data {
efi_guid_t variable_name;
u64 unicode_name_length;
u64 variable_data_length;
u16 unicode_name[1];
u8 variable_data[1];
};
struct efi_tcg2_protocol {
efi_status_t (EFIAPI * get_capability)(struct efi_tcg2_protocol *this,
struct efi_tcg2_boot_service_capability *capability);
efi_status_t (EFIAPI * get_eventlog)(struct efi_tcg2_protocol *this,
efi_tcg_event_log_format log_format,
u64 *event_log_location, u64 *event_log_last_entry,
bool *event_log_truncated);
efi_status_t (EFIAPI * hash_log_extend_event)(struct efi_tcg2_protocol *this,
u64 flags,
efi_physical_addr_t data_to_hash,
u64 data_to_hash_len,
struct efi_tcg2_event *efi_tcg_event);
efi_status_t (EFIAPI * submit_command)(struct efi_tcg2_protocol *this,
u32 input_parameter_block_size,
u8 *input_parameter_block,
u32 output_parameter_block_size,
u8 *output_parameter_block);
efi_status_t (EFIAPI * get_active_pcr_banks)(struct efi_tcg2_protocol *this,
u32 *active_pcr_banks);
efi_status_t (EFIAPI * set_active_pcr_banks)(struct efi_tcg2_protocol *this,
u32 active_pcr_banks);
efi_status_t (EFIAPI * get_result_of_set_active_pcr_banks)(struct efi_tcg2_protocol *this,
u32 *operation_present,
u32 *response);
};
#endif
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