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@@ -0,0 +1,534 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Defines APIs that allow an OS to interact with UEFI firmware to query
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+ * information about the device.
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+ * https://trustedcomputinggroup.org/resource/tcg-efi-protocol-specification/
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+ *
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+ * Copyright (c) 2020, Linaro Limited
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+ */
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+
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+#define LOG_CATEGORY LOGC_EFI
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+#include <common.h>
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+#include <dm.h>
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+#include <efi_loader.h>
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+#include <efi_tcg2.h>
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+#include <log.h>
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+#include <tpm-v2.h>
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+#include <linux/unaligned/access_ok.h>
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+#include <linux/unaligned/generic.h>
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+
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+DECLARE_GLOBAL_DATA_PTR;
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+
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+/*
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+ * When requesting TPM2_CAP_TPM_PROPERTIES the value is on a standard offset.
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+ * Since the current tpm2_get_capability() response buffers starts at
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+ * 'union tpmu_capabilities data' of 'struct tpms_capability_data', calculate
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+ * the response size and offset once for all consumers
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+ */
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+#define TPM2_RESPONSE_BUFFER_SIZE (sizeof(struct tpms_capability_data) - \
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+ offsetof(struct tpms_capability_data, data))
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+#define properties_offset (offsetof(struct tpml_tagged_tpm_property, tpm_property) + \
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+ offsetof(struct tpms_tagged_property, value))
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+
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+const efi_guid_t efi_guid_tcg2_protocol = EFI_TCG2_PROTOCOL_GUID;
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+
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+/**
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+ * platform_get_tpm_device() - retrieve TPM device
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+ *
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+ * This function retrieves the udevice implementing a TPM
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+ *
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+ * This function may be overridden if special initialization is needed.
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+ *
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+ * @dev: udevice
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+ * Return: status code
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+ */
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+__weak efi_status_t platform_get_tpm2_device(struct udevice **dev)
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+{
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+ for_each_tpm_device((*dev)) {
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+ if (tpm_get_version(*dev) == TPM_V2)
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+ return EFI_SUCCESS;
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+ }
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+ return EFI_NOT_FOUND;
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+}
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+
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+/**
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+ * tpm2_get_max_command_size() - get the supported max command size
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+ *
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+ * @dev: TPM device
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+ * @max_command_size: output buffer for the size
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+ *
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+ * Return: 0 on success, -1 on error
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+ */
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+static int tpm2_get_max_command_size(struct udevice *dev, u16 *max_command_size)
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+{
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+ u8 response[TPM2_RESPONSE_BUFFER_SIZE];
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+ u32 ret;
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+
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+ memset(response, 0, sizeof(response));
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+ ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
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+ TPM2_PT_MAX_COMMAND_SIZE, response, 1);
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+ if (ret)
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+ return -1;
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+
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+ *max_command_size = (uint16_t)get_unaligned_be32(response +
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+ properties_offset);
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+
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+ return 0;
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+}
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+
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+/**
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+ * tpm2_get_max_response_size() - get the supported max response size
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+ *
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+ * @dev: TPM device
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+ * @max_response_size: output buffer for the size
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+ *
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+ * Return: 0 on success, -1 on error
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+ */
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+static int tpm2_get_max_response_size(struct udevice *dev,
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+ u16 *max_response_size)
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+{
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+ u8 response[TPM2_RESPONSE_BUFFER_SIZE];
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+ u32 ret;
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+
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+ memset(response, 0, sizeof(response));
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+ ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
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+ TPM2_PT_MAX_RESPONSE_SIZE, response, 1);
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+ if (ret)
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+ return -1;
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+
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+ *max_response_size = (uint16_t)get_unaligned_be32(response +
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+ properties_offset);
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+
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+ return 0;
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+}
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+
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+/**
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+ * tpm2_get_manufacturer_id() - get the manufacturer ID
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+ *
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+ * @dev: TPM device
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+ * @manufacturer_id: output buffer for the id
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+ *
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+ * Return: 0 on success, -1 on error
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+ */
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+static int tpm2_get_manufacturer_id(struct udevice *dev, u32 *manufacturer_id)
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+{
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+ u8 response[TPM2_RESPONSE_BUFFER_SIZE];
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+ u32 ret;
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+
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+ memset(response, 0, sizeof(response));
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+ ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
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+ TPM2_PT_MANUFACTURER, response, 1);
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+ if (ret)
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+ return -1;
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+
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+ *manufacturer_id = get_unaligned_be32(response + properties_offset);
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+
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+ return 0;
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+}
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+
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+/**
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+ * tpm2_get_num_pcr() - get the number of PCRs
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+ *
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+ * @dev: TPM device
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+ * @manufacturer_id: output buffer for the number
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+ *
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+ * Return: 0 on success, -1 on error
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+ */
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+static int tpm2_get_num_pcr(struct udevice *dev, u32 *num_pcr)
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+{
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+ u8 response[TPM2_RESPONSE_BUFFER_SIZE];
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+ u32 ret;
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+
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+ memset(response, 0, sizeof(response));
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+ ret = tpm2_get_capability(dev, TPM2_CAP_TPM_PROPERTIES,
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+ TPM2_PT_PCR_COUNT, response, 1);
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+ if (ret)
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+ return -1;
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+
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+ *num_pcr = get_unaligned_be32(response + properties_offset);
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+ if (*num_pcr > TPM2_MAX_PCRS)
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+ return -1;
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+
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+ return 0;
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+}
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+
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+/**
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+ * is_active_pcr() - Check if a supported algorithm is active
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+ *
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+ * @dev: TPM device
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+ * @selection: struct of PCR information
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+ *
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+ * Return: true if PCR is active
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+ */
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+bool is_active_pcr(struct tpms_pcr_selection *selection)
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+{
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+ int i;
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+ /*
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+ * check the pcr_select. If at least one of the PCRs supports the
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+ * algorithm add it on the active ones
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+ */
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+ for (i = 0; i < selection->size_of_select; i++) {
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+ if (selection->pcr_select[i])
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+ return true;
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+ }
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+
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+ return false;
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+}
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+
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+/**
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+ * tpm2_get_pcr_info() - get the supported, active PCRs and number of banks
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+ *
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+ * @dev: TPM device
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+ * @supported_pcr: bitmask with the algorithms supported
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+ * @active_pcr: bitmask with the active algorithms
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+ * @pcr_banks: number of PCR banks
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+ *
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+ * Return: 0 on success, -1 on error
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+ */
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+static int tpm2_get_pcr_info(struct udevice *dev, u32 *supported_pcr,
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+ u32 *active_pcr, u32 *pcr_banks)
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+{
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+ u8 response[TPM2_RESPONSE_BUFFER_SIZE];
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+ struct tpml_pcr_selection pcrs;
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+ u32 ret, num_pcr;
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+ int i, tpm_ret;
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+
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+ memset(response, 0, sizeof(response));
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+ ret = tpm2_get_capability(dev, TPM2_CAP_PCRS, 0, response, 1);
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+ if (ret)
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+ goto out;
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+
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+ pcrs.count = get_unaligned_be32(response);
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+ /*
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+ * We only support 5 algorithms for now so check against that
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+ * instead of TPM2_NUM_PCR_BANKS
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+ */
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+ if (pcrs.count > MAX_HASH_COUNT || pcrs.count < 1)
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+ goto out;
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+
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+ tpm_ret = tpm2_get_num_pcr(dev, &num_pcr);
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+ if (tpm_ret)
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+ goto out;
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+
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+ for (i = 0; i < pcrs.count; i++) {
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+ /*
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+ * Definition of TPMS_PCR_SELECTION Structure
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+ * hash: u16
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+ * size_of_select: u8
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+ * pcr_select: u8 array
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+ *
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+ * The offsets depend on the number of the device PCRs
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+ * so we have to calculate them based on that
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+ */
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+ u32 hash_offset = offsetof(struct tpml_pcr_selection, selection) +
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+ i * offsetof(struct tpms_pcr_selection, pcr_select) +
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+ i * ((num_pcr + 7) / 8);
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+ u32 size_select_offset =
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+ hash_offset + offsetof(struct tpms_pcr_selection,
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+ size_of_select);
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+ u32 pcr_select_offset =
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+ hash_offset + offsetof(struct tpms_pcr_selection,
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+ pcr_select);
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+
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+ pcrs.selection[i].hash =
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+ get_unaligned_be16(response + hash_offset);
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+ pcrs.selection[i].size_of_select =
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+ __get_unaligned_be(response + size_select_offset);
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+ if (pcrs.selection[i].size_of_select > TPM2_PCR_SELECT_MAX)
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+ goto out;
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+ /* copy the array of pcr_select */
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+ memcpy(pcrs.selection[i].pcr_select, response + pcr_select_offset,
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+ pcrs.selection[i].size_of_select);
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+ }
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+
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+ for (i = 0; i < pcrs.count; i++) {
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+ switch (pcrs.selection[i].hash) {
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+ case TPM2_ALG_SHA1:
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+ *supported_pcr |= EFI_TCG2_BOOT_HASH_ALG_SHA1;
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+ if (is_active_pcr(&pcrs.selection[i]))
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+ *active_pcr |= EFI_TCG2_BOOT_HASH_ALG_SHA1;
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+ break;
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+ case TPM2_ALG_SHA256:
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+ *supported_pcr |= EFI_TCG2_BOOT_HASH_ALG_SHA256;
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+ if (is_active_pcr(&pcrs.selection[i]))
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+ *active_pcr |= EFI_TCG2_BOOT_HASH_ALG_SHA256;
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+ break;
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+ case TPM2_ALG_SHA384:
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+ *supported_pcr |= EFI_TCG2_BOOT_HASH_ALG_SHA384;
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+ if (is_active_pcr(&pcrs.selection[i]))
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+ *active_pcr |= EFI_TCG2_BOOT_HASH_ALG_SHA384;
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+ break;
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+ case TPM2_ALG_SHA512:
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+ *supported_pcr |= EFI_TCG2_BOOT_HASH_ALG_SHA512;
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+ if (is_active_pcr(&pcrs.selection[i]))
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+ *active_pcr |= EFI_TCG2_BOOT_HASH_ALG_SHA512;
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+ break;
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+ case TPM2_ALG_SM3_256:
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+ *supported_pcr |= EFI_TCG2_BOOT_HASH_ALG_SM3_256;
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+ if (is_active_pcr(&pcrs.selection[i]))
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+ *active_pcr |= EFI_TCG2_BOOT_HASH_ALG_SM3_256;
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+ break;
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+ default:
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+ EFI_PRINT("Unknown algorithm %x\n",
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+ pcrs.selection[i].hash);
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+ break;
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+ }
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+ }
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+
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+ *pcr_banks = pcrs.count;
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+
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+ return 0;
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+out:
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+ return -1;
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+}
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+
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+/**
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+ * get_capability() - protocol capability information and state information
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+ *
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+ * @this: TCG2 protocol instance
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+ * @capability: caller allocated memory with size field to the size of
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+ * the structure allocated
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+
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+ * Return: status code
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+ */
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+static efi_status_t EFIAPI
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+get_capability(struct efi_tcg2_protocol *this,
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+ struct efi_tcg2_boot_service_capability *capability)
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+{
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+ struct udevice *dev;
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+ efi_status_t efi_ret;
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+ int ret;
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+
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+ EFI_ENTRY("%p, %p", this, capability);
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+
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+ if (!this || !capability) {
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+ efi_ret = EFI_INVALID_PARAMETER;
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+ goto out;
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+ }
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+
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+ if (capability->size < boot_service_capability_min) {
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+ capability->size = boot_service_capability_min;
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+ efi_ret = EFI_BUFFER_TOO_SMALL;
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+ goto out;
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+ }
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+
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+ if (capability->size < sizeof(*capability)) {
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+ capability->size = sizeof(*capability);
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+ efi_ret = EFI_BUFFER_TOO_SMALL;
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+ goto out;
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+ }
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+
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+ capability->structure_version.major = 1;
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+ capability->structure_version.minor = 1;
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+ capability->protocol_version.major = 1;
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+ capability->protocol_version.minor = 1;
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+
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+ efi_ret = platform_get_tpm2_device(&dev);
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+ if (efi_ret != EFI_SUCCESS) {
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+ capability->supported_event_logs = 0;
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+ capability->hash_algorithm_bitmap = 0;
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+ capability->tpm_present_flag = false;
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+ capability->max_command_size = 0;
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+ capability->max_response_size = 0;
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+ capability->manufacturer_id = 0;
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+ capability->number_of_pcr_banks = 0;
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+ capability->active_pcr_banks = 0;
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+
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+ efi_ret = EFI_SUCCESS;
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+ goto out;
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+ }
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+
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+ /* We only allow a TPMv2 device to register the EFI protocol */
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+ capability->supported_event_logs = TCG2_EVENT_LOG_FORMAT_TCG_2;
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+
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+ capability->tpm_present_flag = true;
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+
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+ /* Supported and active PCRs */
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+ capability->hash_algorithm_bitmap = 0;
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+ capability->active_pcr_banks = 0;
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+ ret = tpm2_get_pcr_info(dev, &capability->hash_algorithm_bitmap,
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+ &capability->active_pcr_banks,
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+ &capability->number_of_pcr_banks);
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+ if (ret) {
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+ efi_ret = EFI_DEVICE_ERROR;
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+ goto out;
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+ }
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+
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+ /* Max command size */
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+ ret = tpm2_get_max_command_size(dev, &capability->max_command_size);
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+ if (ret) {
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+ efi_ret = EFI_DEVICE_ERROR;
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+ goto out;
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+ }
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+
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+ /* Max response size */
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+ ret = tpm2_get_max_response_size(dev, &capability->max_response_size);
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+ if (ret) {
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+ efi_ret = EFI_DEVICE_ERROR;
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+ goto out;
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+ }
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+
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+ /* Manufacturer ID */
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+ ret = tpm2_get_manufacturer_id(dev, &capability->manufacturer_id);
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+ if (ret) {
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+ efi_ret = EFI_DEVICE_ERROR;
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+ goto out;
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+ }
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+
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+ return EFI_EXIT(EFI_SUCCESS);
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+out:
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+ return EFI_EXIT(efi_ret);
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+}
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+
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+/**
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+ * get_eventlog() - retrieve the the address of an event log and its last entry
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+ *
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+ * @this: TCG2 protocol instance
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+ * @log_format: type of event log format
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+ * @event_log_location: pointer to the memory address of the event log
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+ * @event_log_last_entry: pointer to the address of the start of the last
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+ * entry in the event log in memory, if log contains
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+ * more than 1 entry
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+ * @event_log_truncated: set to true, if the Event Log is missing at i
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+ * least one entry
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+ *
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+ * Return: status code
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+ */
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|
|
+static 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)
|
|
|
+{
|
|
|
+ return EFI_UNSUPPORTED;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * 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
|
|
|
+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;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * 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
|
|
|
+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;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * 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
|
|
|
+get_active_pcr_banks(struct efi_tcg2_protocol *this, u32 *active_pcr_banks)
|
|
|
+{
|
|
|
+ return EFI_UNSUPPORTED;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * 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
|
|
|
+set_active_pcr_banks(struct efi_tcg2_protocol *this, u32 active_pcr_banks)
|
|
|
+{
|
|
|
+ return EFI_UNSUPPORTED;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * get_result_of_set_active_pcr_banks() - retrieves the result of a 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
|
|
|
+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 = get_capability,
|
|
|
+ .get_eventlog = get_eventlog,
|
|
|
+ .hash_log_extend_event = hash_log_extend_event,
|
|
|
+ .submit_command = submit_command,
|
|
|
+ .get_active_pcr_banks = get_active_pcr_banks,
|
|
|
+ .set_active_pcr_banks = set_active_pcr_banks,
|
|
|
+ .get_result_of_set_active_pcr_banks = 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;
|
|
|
+ enum tpm_version tpm_ver;
|
|
|
+
|
|
|
+ ret = platform_get_tpm2_device(&dev);
|
|
|
+ if (ret != EFI_SUCCESS)
|
|
|
+ return EFI_SUCCESS;
|
|
|
+
|
|
|
+ tpm_ver = tpm_get_version(dev);
|
|
|
+ if (tpm_ver != TPM_V2) {
|
|
|
+ log_warning("Only TPMv2 supported for EFI_TCG2_PROTOCOL\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;
|
|
|
+}
|