[PATCH 2/2 v5] efi: Add basic EFI_TCG2_PROTOCOL support
Ilias Apalodimas
ilias.apalodimas at linaro.org
Thu Nov 12 23:22:10 CET 2020
Since U-boot EFI implementation is getting richer it makes sense to
add support for EFI_TCG2_PROTOCOL taking advantage of any hardware TPM
available on the device.
This is the initial implementation of the protocol which only adds
support for GetCapability(). It's limited in the newer and safer
TPMv2 devices.
Signed-off-by: Ilias Apalodimas <ilias.apalodimas at linaro.org>
---
Heinrich has a basic EFI selftest [1] which works on actual hardware.
Unfortunately the sandbox TPMv2 doesn't support any of the current
capability or PCR information calls the EFI protocol requires.
Specifically it does not support:
- TPM2_CAP_TPM_PROPERTIES for max command size, max response size, vendor id
number of PCRs.
- TPM2_CAP_PCRS for getting info on the supported and active PCR banks.
[1] https://github.com/xypron/u-boot-patches/blob/efi-next/0001-efi_selftest-provide-unit-test-for-the-EFI_TCG2_PROT.patch
Adding those on a software implementation is not trivial.
* changes since v4:
- scan all tpm devices on platform_get_tpm2_device() to find a tpmv2 device
- add efi_tcg2_ prefix on all efi protocol functions
- put algorithm related info in an array of structs and simplify calculation
of supported and active PCR banks in tpm2_get_pcr_info()
* changes since v3:
- added check for maximum number of PCRs allowed
- replaced multiple return Xl with goto out tags
* changes since v2:
- added description about include/efi_tcg2.h
- switch bool to u8 for tpm_present_flag
- removed superfluous 'default n' from Kconfig
- use 'goto 'tag' when possible
* changes since v1:
- change return variable of platform_get_tpm2_device() when used
- since more headers were included in patch #2 use them in offset
calculations for all tpm commands
- change the size of the response buffer regardless of what
tpm2_get_capability() is doing
include/efi_loader.h | 2 +
include/efi_tcg2.h | 92 ++++++
lib/efi_loader/Kconfig | 7 +
lib/efi_loader/Makefile | 1 +
lib/efi_loader/efi_setup.c | 8 +
lib/efi_loader/efi_tcg2.c | 558 +++++++++++++++++++++++++++++++++++++
6 files changed, 668 insertions(+)
create mode 100644 include/efi_tcg2.h
create mode 100644 lib/efi_loader/efi_tcg2.c
diff --git a/include/efi_loader.h b/include/efi_loader.h
index f550ced56876..e5015d865ec9 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -405,6 +405,8 @@ efi_status_t efi_console_register(void);
efi_status_t efi_disk_register(void);
/* Called by efi_init_obj_list() to install EFI_RNG_PROTOCOL */
efi_status_t efi_rng_register(void);
+/* Called by efi_init_obj_list() to install EFI_TCG2_PROTOCOL */
+efi_status_t efi_tcg2_register(void);
/* Create handles and protocols for the partitions of a block device */
int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
const char *if_typename, int diskid,
diff --git a/include/efi_tcg2.h b/include/efi_tcg2.h
new file mode 100644
index 000000000000..86b8fe4c01af
--- /dev/null
+++ b/include/efi_tcg2.h
@@ -0,0 +1,92 @@
+/* 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
+ *
+ * Copyright (c) 2020, Linaro Limited
+ */
+
+#if !defined _EFI_TCG2_PROTOCOL_H_
+#define _EFI_TCG2_PROTOCOL_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
+
+/* 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
+
+typedef u32 efi_tcg_event_log_bitmap;
+typedef u32 efi_tcg_event_log_format;
+typedef u32 efi_tcg_event_algorithm_bitmap;
+
+struct efi_tcg2_version {
+ u8 major;
+ u8 minor;
+};
+
+struct efi_tcg2_event_header {
+ u32 header_size;
+ u16 header_version;
+ u32 pcr_index;
+ u32 event_type;
+} __packed;
+
+struct efi_tcg2_event {
+ u32 size;
+ struct efi_tcg2_event_header header;
+ u8 event[];
+} __packed;
+
+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;
+};
+
+#define boot_service_capability_min \
+ sizeof(struct efi_tcg2_boot_service_capability) - \
+ offsetof(struct efi_tcg2_boot_service_capability, number_of_pcr_banks)
+
+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, u64 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
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index 075481428cdf..29ea14b2ee2a 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -184,6 +184,13 @@ config EFI_RNG_PROTOCOL
Provide a EFI_RNG_PROTOCOL implementation using the hardware random
number generator of the platform.
+config EFI_TCG2_PROTOCOL
+ bool "EFI_TCG2_PROTOCOL support"
+ depends on TPM_V2
+ help
+ Provide a EFI_TCG2_PROTOCOL implementation using the TPM hardware
+ of the platform.
+
config EFI_LOAD_FILE2_INITRD
bool "EFI_FILE_LOAD2_PROTOCOL for Linux initial ramdisk"
default n
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 8892fb01e125..cd4b252a417c 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -53,6 +53,7 @@ obj-$(CONFIG_NET) += efi_net.o
obj-$(CONFIG_GENERATE_ACPI_TABLE) += efi_acpi.o
obj-$(CONFIG_GENERATE_SMBIOS_TABLE) += efi_smbios.o
obj-$(CONFIG_EFI_RNG_PROTOCOL) += efi_rng.o
+obj-$(CONFIG_EFI_TCG2_PROTOCOL) += efi_tcg2.o
obj-$(CONFIG_EFI_LOAD_FILE2_INITRD) += efi_load_initrd.o
obj-y += efi_signature.o
diff --git a/lib/efi_loader/efi_setup.c b/lib/efi_loader/efi_setup.c
index 45226c5c1a53..07b2b6c1c469 100644
--- a/lib/efi_loader/efi_setup.c
+++ b/lib/efi_loader/efi_setup.c
@@ -156,6 +156,7 @@ efi_status_t efi_init_obj_list(void)
if (ret != EFI_SUCCESS)
goto out;
}
+
/* Initialize variable services */
ret = efi_init_variables();
if (ret != EFI_SUCCESS)
@@ -182,6 +183,13 @@ efi_status_t efi_init_obj_list(void)
if (ret != EFI_SUCCESS)
goto out;
+ /* Initialize TCG2 protocol */
+ if (IS_ENABLED(CONFIG_EFI_TCG2_PROTOCOL)) {
+ ret = efi_tcg2_register();
+ if (ret != EFI_SUCCESS)
+ goto out;
+ }
+
/* Secure boot */
ret = efi_init_secure_boot();
if (ret != EFI_SUCCESS)
diff --git a/lib/efi_loader/efi_tcg2.c b/lib/efi_loader/efi_tcg2.c
new file mode 100644
index 000000000000..62f2f9427b6e
--- /dev/null
+++ b/lib/efi_loader/efi_tcg2.c
@@ -0,0 +1,558 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Defines APIs that allow an OS to interact with UEFI firmware to query
+ * information about the device.
+ * https://trustedcomputinggroup.org/resource/tcg-efi-protocol-specification/
+ *
+ * Copyright (c) 2020, Linaro Limited
+ */
+
+#define LOG_CATEGORY LOGC_EFI
+#include <common.h>
+#include <dm.h>
+#include <efi_loader.h>
+#include <efi_tcg2.h>
+#include <log.h>
+#include <tpm-v2.h>
+#include <linux/unaligned/access_ok.h>
+#include <linux/unaligned/generic.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * When requesting TPM2_CAP_TPM_PROPERTIES the value is on a standard offset.
+ * Since the current tpm2_get_capability() response buffers starts at
+ * 'union tpmu_capabilities data' of 'struct tpms_capability_data', calculate
+ * the response size and offset once for all consumers
+ */
+#define TPM2_RESPONSE_BUFFER_SIZE (sizeof(struct tpms_capability_data) - \
+ offsetof(struct tpms_capability_data, data))
+#define properties_offset (offsetof(struct tpml_tagged_tpm_property, tpm_property) + \
+ offsetof(struct tpms_tagged_property, value))
+
+struct {
+ u16 hash_alg;
+ u32 hash_mask;
+} hash_algo_list[] = {
+ {
+ TPM2_ALG_SHA1,
+ EFI_TCG2_BOOT_HASH_ALG_SHA1,
+ },
+ {
+ TPM2_ALG_SHA256,
+ EFI_TCG2_BOOT_HASH_ALG_SHA256,
+ },
+ {
+ TPM2_ALG_SHA384,
+ EFI_TCG2_BOOT_HASH_ALG_SHA384,
+ },
+ {
+ TPM2_ALG_SHA512,
+ EFI_TCG2_BOOT_HASH_ALG_SHA512,
+ },
+ {
+ TPM2_ALG_SM3_256,
+ EFI_TCG2_BOOT_HASH_ALG_SM3_256,
+ },
+};
+
+#define MAX_HASH_COUNT ARRAY_SIZE(hash_algo_list)
+/**
+ * alg_to_mask - Get a TCG hash mask for algorithms
+ *
+ * @hash_alg: TCG defined algorithm
+ *
+ * @Return: TCG hashing algorithm bitmaps, 0 if the algorithm is not supported
+ */
+static u32 alg_to_mask(u16 hash_alg)
+{
+ int i;
+
+ for (i = 0; i < MAX_HASH_COUNT; i++) {
+ if (hash_algo_list[i].hash_alg == hash_alg)
+ return hash_algo_list[i].hash_mask;
+ }
+
+ return 0;
+}
+
+const efi_guid_t efi_guid_tcg2_protocol = EFI_TCG2_PROTOCOL_GUID;
+
+/**
+ * platform_get_tpm_device() - retrieve TPM device
+ *
+ * This function retrieves the udevice implementing a TPM
+ *
+ * This function may be overridden if special initialization is needed.
+ *
+ * @dev: udevice
+ * Return: status code
+ */
+__weak efi_status_t platform_get_tpm2_device(struct udevice **dev)
+{
+ for_each_tpm_device(*dev) {
+ /* Only support TPMv2 devices */
+ if (tpm_get_version(*dev) == TPM_V2)
+ return EFI_SUCCESS;
+ }
+
+ return EFI_NOT_FOUND;
+}
+
+/**
+ * tpm2_get_max_command_size() - get the supported max command size
+ *
+ * @dev: TPM device
+ * @max_command_size: output buffer for the size
+ *
+ * Return: 0 on success, -1 on error
+ */
+static int tpm2_get_max_command_size(struct udevice *dev, u16 *max_command_size)
+{
+ u8 response[TPM2_RESPONSE_BUFFER_SIZE];
+ u32 ret;
+
+ memset(response, 0, sizeof(response));
+ ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
+ TPM2_PT_MAX_COMMAND_SIZE, response, 1);
+ if (ret)
+ return -1;
+
+ *max_command_size = (uint16_t)get_unaligned_be32(response +
+ properties_offset);
+
+ return 0;
+}
+
+/**
+ * tpm2_get_max_response_size() - get the supported max response size
+ *
+ * @dev: TPM device
+ * @max_response_size: output buffer for the size
+ *
+ * Return: 0 on success, -1 on error
+ */
+static int tpm2_get_max_response_size(struct udevice *dev,
+ u16 *max_response_size)
+{
+ u8 response[TPM2_RESPONSE_BUFFER_SIZE];
+ u32 ret;
+
+ memset(response, 0, sizeof(response));
+ ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
+ TPM2_PT_MAX_RESPONSE_SIZE, response, 1);
+ if (ret)
+ return -1;
+
+ *max_response_size = (uint16_t)get_unaligned_be32(response +
+ properties_offset);
+
+ return 0;
+}
+
+/**
+ * tpm2_get_manufacturer_id() - get the manufacturer ID
+ *
+ * @dev: TPM device
+ * @manufacturer_id: output buffer for the id
+ *
+ * Return: 0 on success, -1 on error
+ */
+static int tpm2_get_manufacturer_id(struct udevice *dev, u32 *manufacturer_id)
+{
+ u8 response[TPM2_RESPONSE_BUFFER_SIZE];
+ u32 ret;
+
+ memset(response, 0, sizeof(response));
+ ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
+ TPM2_PT_MANUFACTURER, response, 1);
+ if (ret)
+ return -1;
+
+ *manufacturer_id = get_unaligned_be32(response + properties_offset);
+
+ return 0;
+}
+
+/**
+ * tpm2_get_num_pcr() - get the number of PCRs
+ *
+ * @dev: TPM device
+ * @manufacturer_id: output buffer for the number
+ *
+ * Return: 0 on success, -1 on error
+ */
+static int tpm2_get_num_pcr(struct udevice *dev, u32 *num_pcr)
+{
+ u8 response[TPM2_RESPONSE_BUFFER_SIZE];
+ u32 ret;
+
+ memset(response, 0, sizeof(response));
+ ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
+ TPM2_PT_PCR_COUNT, response, 1);
+ if (ret)
+ return -1;
+
+ *num_pcr = get_unaligned_be32(response + properties_offset);
+ if (*num_pcr > TPM2_MAX_PCRS)
+ return -1;
+
+ return 0;
+}
+
+/**
+ * is_active_pcr() - Check if a supported algorithm is active
+ *
+ * @dev: TPM device
+ * @selection: struct of PCR information
+ *
+ * Return: true if PCR is active
+ */
+bool is_active_pcr(struct tpms_pcr_selection *selection)
+{
+ int i;
+ /*
+ * check the pcr_select. If at least one of the PCRs supports the
+ * algorithm add it on the active ones
+ */
+ for (i = 0; i < selection->size_of_select; i++) {
+ if (selection->pcr_select[i])
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * tpm2_get_pcr_info() - get the supported, active PCRs and number of banks
+ *
+ * @dev: TPM device
+ * @supported_pcr: bitmask with the algorithms supported
+ * @active_pcr: bitmask with the active algorithms
+ * @pcr_banks: number of PCR banks
+ *
+ * Return: 0 on success, -1 on error
+ */
+static int tpm2_get_pcr_info(struct udevice *dev, u32 *supported_pcr,
+ u32 *active_pcr, u32 *pcr_banks)
+{
+ u8 response[TPM2_RESPONSE_BUFFER_SIZE];
+ struct tpml_pcr_selection pcrs;
+ u32 ret, num_pcr;
+ int i, tpm_ret;
+
+ memset(response, 0, sizeof(response));
+ ret = tpm2_get_capability(dev, TPM2_CAP_PCRS, 0, response, 1);
+ if (ret)
+ goto out;
+
+ pcrs.count = get_unaligned_be32(response);
+ /*
+ * We only support 5 algorithms for now so check against that
+ * instead of TPM2_NUM_PCR_BANKS
+ */
+ if (pcrs.count > MAX_HASH_COUNT || pcrs.count < 1)
+ goto out;
+
+ tpm_ret = tpm2_get_num_pcr(dev, &num_pcr);
+ if (tpm_ret)
+ goto out;
+
+ for (i = 0; i < pcrs.count; i++) {
+ /*
+ * Definition of TPMS_PCR_SELECTION Structure
+ * hash: u16
+ * size_of_select: u8
+ * pcr_select: u8 array
+ *
+ * The offsets depend on the number of the device PCRs
+ * so we have to calculate them based on that
+ */
+ u32 hash_offset = offsetof(struct tpml_pcr_selection, selection) +
+ i * offsetof(struct tpms_pcr_selection, pcr_select) +
+ i * ((num_pcr + 7) / 8);
+ u32 size_select_offset =
+ hash_offset + offsetof(struct tpms_pcr_selection,
+ size_of_select);
+ u32 pcr_select_offset =
+ hash_offset + offsetof(struct tpms_pcr_selection,
+ pcr_select);
+
+ pcrs.selection[i].hash =
+ get_unaligned_be16(response + hash_offset);
+ pcrs.selection[i].size_of_select =
+ __get_unaligned_be(response + size_select_offset);
+ if (pcrs.selection[i].size_of_select > TPM2_PCR_SELECT_MAX)
+ goto out;
+ /* copy the array of pcr_select */
+ memcpy(pcrs.selection[i].pcr_select, response + pcr_select_offset,
+ pcrs.selection[i].size_of_select);
+ }
+
+ for (i = 0; i < pcrs.count; i++) {
+ u32 hash_mask = alg_to_mask(pcrs.selection[i].hash);
+
+ if (hash_mask) {
+ *supported_pcr |= hash_mask;
+ if (is_active_pcr(&pcrs.selection[i]))
+ *active_pcr |= hash_mask;
+ } else {
+ EFI_PRINT("Unknown algorithm %x\n", pcrs.selection[i].hash);
+ }
+ }
+
+ *pcr_banks = pcrs.count;
+
+ return 0;
+out:
+ return -1;
+}
+
+/**
+ * efi_tcg2_get_capability() - protocol capability information and state information
+ *
+ * @this: TCG2 protocol instance
+ * @capability: caller allocated memory with size field to the size of
+ * the structure allocated
+
+ * Return: status code
+ */
+static efi_status_t EFIAPI
+efi_tcg2_get_capability(struct efi_tcg2_protocol *this,
+ struct efi_tcg2_boot_service_capability *capability)
+{
+ struct udevice *dev;
+ efi_status_t efi_ret;
+ int ret;
+
+ EFI_ENTRY("%p, %p", this, capability);
+
+ if (!this || !capability) {
+ efi_ret = EFI_INVALID_PARAMETER;
+ goto out;
+ }
+
+ if (capability->size < boot_service_capability_min) {
+ capability->size = boot_service_capability_min;
+ efi_ret = EFI_BUFFER_TOO_SMALL;
+ goto out;
+ }
+
+ if (capability->size < sizeof(*capability)) {
+ capability->size = sizeof(*capability);
+ efi_ret = EFI_BUFFER_TOO_SMALL;
+ goto out;
+ }
+
+ capability->structure_version.major = 1;
+ capability->structure_version.minor = 1;
+ capability->protocol_version.major = 1;
+ capability->protocol_version.minor = 1;
+
+ efi_ret = platform_get_tpm2_device(&dev);
+ if (efi_ret != EFI_SUCCESS) {
+ capability->supported_event_logs = 0;
+ capability->hash_algorithm_bitmap = 0;
+ capability->tpm_present_flag = false;
+ capability->max_command_size = 0;
+ capability->max_response_size = 0;
+ capability->manufacturer_id = 0;
+ capability->number_of_pcr_banks = 0;
+ capability->active_pcr_banks = 0;
+
+ efi_ret = EFI_SUCCESS;
+ goto out;
+ }
+
+ /* We only allow a TPMv2 device to register the EFI protocol */
+ capability->supported_event_logs = TCG2_EVENT_LOG_FORMAT_TCG_2;
+
+ capability->tpm_present_flag = true;
+
+ /* Supported and active PCRs */
+ capability->hash_algorithm_bitmap = 0;
+ capability->active_pcr_banks = 0;
+ ret = tpm2_get_pcr_info(dev, &capability->hash_algorithm_bitmap,
+ &capability->active_pcr_banks,
+ &capability->number_of_pcr_banks);
+ if (ret) {
+ efi_ret = EFI_DEVICE_ERROR;
+ goto out;
+ }
+
+ /* Max command size */
+ ret = tpm2_get_max_command_size(dev, &capability->max_command_size);
+ if (ret) {
+ efi_ret = EFI_DEVICE_ERROR;
+ goto out;
+ }
+
+ /* Max response size */
+ ret = tpm2_get_max_response_size(dev, &capability->max_response_size);
+ if (ret) {
+ efi_ret = EFI_DEVICE_ERROR;
+ goto out;
+ }
+
+ /* Manufacturer ID */
+ ret = tpm2_get_manufacturer_id(dev, &capability->manufacturer_id);
+ if (ret) {
+ efi_ret = EFI_DEVICE_ERROR;
+ goto out;
+ }
+
+ return EFI_EXIT(EFI_SUCCESS);
+out:
+ return EFI_EXIT(efi_ret);
+}
+
+/**
+ * efi_tcg2_get_eventlog() - retrieve the the address of an event log and its
+ * last entry
+ *
+ * @this: TCG2 protocol instance
+ * @log_format: type of event log format
+ * @event_log_location: pointer to the memory address of the event log
+ * @event_log_last_entry: pointer to the address of the start of the last
+ * entry in the event log in memory, if log contains
+ * more than 1 entry
+ * @event_log_truncated: set to true, if the Event Log is missing at i
+ * least one entry
+ *
+ * Return: status code
+ */
+static efi_status_t EFIAPI
+efi_tcg2_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)
+{
+ return EFI_UNSUPPORTED;
+}
+
+/**
+ * efi_tcg2_hash_log_extend_event() - extend and optionally log events
+ *
+ * @this: TCG2 protocol instance
+ * @flags: bitmap providing additional information on the
+ * operation
+ * @data_to_hash: physical address of the start of the data buffer
+ * to be hashed
+ * @data_to_hash_len: the length in bytes of the buffer referenced by
+ * data_to_hash
+ * @efi_tcg_event: pointer to data buffer containing information
+ * about the event
+ *
+ * Return: status code
+ */
+static efi_status_t EFIAPI
+efi_tcg2_hash_log_extend_event(struct efi_tcg2_protocol *this, u64 flags,
+ u64 data_to_hash, u64 data_to_hash_len,
+ struct efi_tcg2_event *efi_tcg_event)
+{
+ return EFI_UNSUPPORTED;
+}
+
+/**
+ * efi_tcg2_submit_command() - Send command to the TPM
+ *
+ * @this: TCG2 protocol instance
+ * @input_param_block_size: size of the TPM input parameter block
+ * @input_param_block: pointer to the TPM input parameter block
+ * @output_param_block_size: size of the TPM output parameter block
+ * @output_param_block: pointer to the TPM output parameter block
+ *
+ * Return: status code
+ */
+efi_status_t EFIAPI
+efi_tcg2_submit_command(struct efi_tcg2_protocol *this,
+ u32 input_param_block_size, u8 *input_param_block,
+ u32 output_param_block_size, u8 *output_param_block)
+{
+ return EFI_UNSUPPORTED;
+}
+
+/**
+ * efi_tcg2_get_active_pcr_banks() - returns the currently active PCR banks
+ *
+ * @this: TCG2 protocol instance
+ * @active_pcr_banks: pointer for receiving the bitmap of currently
+ * active PCR banks
+ *
+ * Return: status code
+ */
+efi_status_t EFIAPI
+efi_tcg2_get_active_pcr_banks(struct efi_tcg2_protocol *this,
+ u32 *active_pcr_banks)
+{
+ return EFI_UNSUPPORTED;
+}
+
+/**
+ * efi_tcg2_set_active_pcr_banks() - sets the currently active PCR banks
+ *
+ * @this: TCG2 protocol instance
+ * @active_pcr_banks: bitmap of the requested active PCR banks
+ *
+ * Return: status code
+ */
+efi_status_t EFIAPI
+efi_tcg2_set_active_pcr_banks(struct efi_tcg2_protocol *this,
+ u32 active_pcr_banks)
+{
+ return EFI_UNSUPPORTED;
+}
+
+/**
+ * efi_tcg2_get_result_of_set_active_pcr_banks() - retrieve result for previous
+ * set_active_pcr_banks()
+ *
+ * @this: TCG2 protocol instance
+ * @operation_present: non-zero value to indicate a
+ * set_active_pcr_banks operation was
+ * invoked during last boot
+ * @response: result value could be returned
+ *
+ * Return: status code
+ */
+efi_status_t EFIAPI
+efi_tcg2_get_result_of_set_active_pcr_banks(struct efi_tcg2_protocol *this,
+ u32 *operation_present, u32 *response)
+{
+ return EFI_UNSUPPORTED;
+}
+
+static const struct efi_tcg2_protocol efi_tcg2_protocol = {
+ .get_capability = efi_tcg2_get_capability,
+ .get_eventlog = efi_tcg2_get_eventlog,
+ .hash_log_extend_event = efi_tcg2_hash_log_extend_event,
+ .submit_command = efi_tcg2_submit_command,
+ .get_active_pcr_banks = efi_tcg2_get_active_pcr_banks,
+ .set_active_pcr_banks = efi_tcg2_set_active_pcr_banks,
+ .get_result_of_set_active_pcr_banks = efi_tcg2_get_result_of_set_active_pcr_banks,
+};
+
+/**
+ * efi_tcg2_register() - register EFI_TCG2_PROTOCOL
+ *
+ * If a TPM2 device is available, the TPM TCG2 Protocol is registered
+ *
+ * Return: An error status is only returned if adding the protocol fails.
+ */
+efi_status_t efi_tcg2_register(void)
+{
+ efi_status_t ret;
+ struct udevice *dev;
+
+ ret = platform_get_tpm2_device(&dev);
+ if (ret != EFI_SUCCESS) {
+ log_warning("Unable to find TPMv2 device\n");
+ return EFI_SUCCESS;
+ }
+ ret = efi_add_protocol(efi_root, &efi_guid_tcg2_protocol,
+ (void *)&efi_tcg2_protocol);
+ if (ret != EFI_SUCCESS)
+ log_err("Cannot install EFI_TCG2_PROTOCOL\n");
+
+ return ret;
+}
--
2.29.2
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