tpm: Move TCG functions into a separate file
The previous patch is moving the TPM TCG headers in their own file for
a cleaner API. Move the functions in their own file as well.
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/include/tpm_tcg2.h b/include/tpm_tcg2.h
index 581ff6f..4e4ea1e 100644
--- a/include/tpm_tcg2.h
+++ b/include/tpm_tcg2.h
@@ -142,5 +142,194 @@
#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 tcg2_event_log - Container for managing the platform event log
+ *
+ * @log: Address of the log
+ * @log_position: Current entry position
+ * @log_size: Log space available
+ * @found: Boolean indicating if an existing log was discovered
+ */
+struct tcg2_event_log {
+ u8 *log;
+ u32 log_position;
+ u32 log_size;
+ bool found;
+};
+
+/**
+ * Create a list of digests of the supported PCR banks for a given input data
+ *
+ * @dev TPM device
+ * @input Data
+ * @length Length of the data to calculate the digest
+ * @digest_list List of digests to fill in
+ *
+ * Return: zero on success, negative errno otherwise
+ */
+int tcg2_create_digest(struct udevice *dev, const u8 *input, u32 length,
+ struct tpml_digest_values *digest_list);
+
+/**
+ * Get the event size of the specified digests
+ *
+ * @digest_list List of digests for the event
+ *
+ * Return: Size in bytes of the event
+ */
+u32 tcg2_event_get_size(struct tpml_digest_values *digest_list);
+
+/**
+ * tcg2_get_active_pcr_banks
+ *
+ * @dev TPM device
+ * @active_pcr_banks Bitmask of PCR algorithms supported
+ *
+ * Return: zero on success, negative errno otherwise
+ */
+int tcg2_get_active_pcr_banks(struct udevice *dev, u32 *active_pcr_banks);
+
+/**
+ * tcg2_log_append - Append an event to an event log
+ *
+ * @pcr_index Index of the PCR
+ * @event_type Type of event
+ * @digest_list List of digests to add
+ * @size Size of event
+ * @event Event data
+ * @log Log buffer to append the event to
+ */
+void tcg2_log_append(u32 pcr_index, u32 event_type,
+ struct tpml_digest_values *digest_list, u32 size,
+ const u8 *event, u8 *log);
+
+/**
+ * Extend the PCR with specified digests
+ *
+ * @dev TPM device
+ * @pcr_index Index of the PCR
+ * @digest_list List of digests to extend
+ *
+ * Return: zero on success, negative errno otherwise
+ */
+int tcg2_pcr_extend(struct udevice *dev, u32 pcr_index,
+ struct tpml_digest_values *digest_list);
+
+/**
+ * Read the PCR into a list of digests
+ *
+ * @dev TPM device
+ * @pcr_index Index of the PCR
+ * @digest_list List of digests to extend
+ *
+ * Return: zero on success, negative errno otherwise
+ */
+int tcg2_pcr_read(struct udevice *dev, u32 pcr_index,
+ struct tpml_digest_values *digest_list);
+
+/**
+ * Measure data into the TPM PCRs and the platform event log.
+ *
+ * @dev TPM device
+ * @log Platform event log
+ * @pcr_index Index of the PCR
+ * @size Size of the data or 0 for event only
+ * @data Pointer to the data or NULL for event only
+ * @event_type Event log type
+ * @event_size Size of the event
+ * @event Pointer to the event
+ *
+ * Return: zero on success, negative errno otherwise
+ */
+int tcg2_measure_data(struct udevice *dev, struct tcg2_event_log *elog,
+ u32 pcr_index, u32 size, const u8 *data, u32 event_type,
+ u32 event_size, const u8 *event);
+
+#define tcg2_measure_event(dev, elog, pcr_index, event_type, size, event) \
+ tcg2_measure_data(dev, elog, pcr_index, 0, NULL, event_type, size, \
+ event)
+
+/**
+ * Prepare the event log buffer. This function tries to discover an existing
+ * event log in memory from a previous bootloader stage. If such a log exists
+ * and the PCRs are not extended, the log is "replayed" to extend the PCRs.
+ * If no log is discovered, create the log header.
+ *
+ * @dev TPM device
+ * @elog Platform event log. The log pointer and log_size
+ * members must be initialized to either 0 or to a valid
+ * memory region, in which case any existing log
+ * discovered will be copied to the specified memory
+ * region.
+ * @ignore_existing_log Boolean to indicate whether or not to ignore an
+ * existing platform log in memory
+ *
+ * Return: zero on success, negative errno otherwise
+ */
+int tcg2_log_prepare_buffer(struct udevice *dev, struct tcg2_event_log *elog,
+ bool ignore_existing_log);
+
+/**
+ * Begin measurements.
+ *
+ * @dev TPM device
+ * @elog Platform event log. The log pointer and log_size
+ * members must be initialized to either 0 or to a valid
+ * memory region, in which case any existing log
+ * discovered will be copied to the specified memory
+ * region.
+ * @ignore_existing_log Boolean to indicate whether or not to ignore an
+ * existing platform log in memory
+ *
+ * Return: zero on success, negative errno otherwise
+ */
+int tcg2_measurement_init(struct udevice **dev, struct tcg2_event_log *elog,
+ bool ignore_existing_log);
+
+/**
+ * Stop measurements and record separator events.
+ *
+ * @dev TPM device
+ * @elog Platform event log
+ * @error Boolean to indicate whether an error ocurred or not
+ */
+void tcg2_measurement_term(struct udevice *dev, struct tcg2_event_log *elog,
+ bool error);
+
+/**
+ * Get the platform event log address and size.
+ *
+ * @dev TPM device
+ * @addr Address of the log
+ * @size Size of the log
+ *
+ * Return: zero on success, negative errno otherwise
+ */
+int tcg2_platform_get_log(struct udevice *dev, void **addr, u32 *size);
+
+/**
+ * Get the first TPM2 device found.
+ *
+ * @dev TPM device
+ *
+ * Return: zero on success, negative errno otherwise
+ */
+int tcg2_platform_get_tpm2(struct udevice **dev);
+
+/**
+ * Platform-specific function for handling TPM startup errors
+ *
+ * @dev TPM device
+ * @rc The TPM response code
+ */
+void tcg2_platform_startup_error(struct udevice *dev, int rc);
+
+/**
+ * tcg2_algorithm_to_mask() - Get a TCG hash mask for algorithm
+ *
+ * @hash_alg: TCG defined algorithm
+ * Return: TCG hashing algorithm bitmaps (or 0 if algo not supported)
+ */
+u32 tcg2_algorithm_to_mask(enum tpm2_algorithms);
#endif /* __TPM_TCG_V2_H */