+#ifdef CONFIG_OPTEE_TA_AVB
+static AvbIOResult read_persistent_value(AvbOps *ops,
+ const char *name,
+ size_t buffer_size,
+ u8 *out_buffer,
+ size_t *out_num_bytes_read)
+{
+ AvbIOResult rc;
+ struct tee_shm *shm_name;
+ struct tee_shm *shm_buf;
+ struct tee_param param[2];
+ struct udevice *tee;
+ size_t name_size = strlen(name) + 1;
+
+ if (get_open_session(ops->user_data))
+ return AVB_IO_RESULT_ERROR_IO;
+
+ tee = ((struct AvbOpsData *)ops->user_data)->tee;
+
+ rc = tee_shm_alloc(tee, name_size,
+ TEE_SHM_ALLOC, &shm_name);
+ if (rc)
+ return AVB_IO_RESULT_ERROR_OOM;
+
+ rc = tee_shm_alloc(tee, buffer_size,
+ TEE_SHM_ALLOC, &shm_buf);
+ if (rc) {
+ rc = AVB_IO_RESULT_ERROR_OOM;
+ goto free_name;
+ }
+
+ memcpy(shm_name->addr, name, name_size);
+
+ memset(param, 0, sizeof(param));
+ param[0].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT;
+ param[0].u.memref.shm = shm_name;
+ param[0].u.memref.size = name_size;
+ param[1].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INOUT;
+ param[1].u.memref.shm = shm_buf;
+ param[1].u.memref.size = buffer_size;
+
+ rc = invoke_func(ops->user_data, TA_AVB_CMD_READ_PERSIST_VALUE,
+ 2, param);
+ if (rc)
+ goto out;
+
+ if (param[1].u.memref.size > buffer_size) {
+ rc = AVB_IO_RESULT_ERROR_NO_SUCH_VALUE;
+ goto out;
+ }
+
+ *out_num_bytes_read = param[1].u.memref.size;
+
+ memcpy(out_buffer, shm_buf->addr, *out_num_bytes_read);
+
+out:
+ tee_shm_free(shm_buf);
+free_name:
+ tee_shm_free(shm_name);
+
+ return rc;
+}
+
+static AvbIOResult write_persistent_value(AvbOps *ops,
+ const char *name,
+ size_t value_size,
+ const u8 *value)
+{
+ AvbIOResult rc;
+ struct tee_shm *shm_name;
+ struct tee_shm *shm_buf;
+ struct tee_param param[2];
+ struct udevice *tee;
+ size_t name_size = strlen(name) + 1;
+
+ if (get_open_session(ops->user_data))
+ return AVB_IO_RESULT_ERROR_IO;
+
+ tee = ((struct AvbOpsData *)ops->user_data)->tee;
+
+ if (!value_size)
+ return AVB_IO_RESULT_ERROR_NO_SUCH_VALUE;
+
+ rc = tee_shm_alloc(tee, name_size,
+ TEE_SHM_ALLOC, &shm_name);
+ if (rc)
+ return AVB_IO_RESULT_ERROR_OOM;
+
+ rc = tee_shm_alloc(tee, value_size,
+ TEE_SHM_ALLOC, &shm_buf);
+ if (rc) {
+ rc = AVB_IO_RESULT_ERROR_OOM;
+ goto free_name;
+ }
+
+ memcpy(shm_name->addr, name, name_size);
+ memcpy(shm_buf->addr, value, value_size);
+
+ memset(param, 0, sizeof(param));
+ param[0].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT;
+ param[0].u.memref.shm = shm_name;
+ param[0].u.memref.size = name_size;
+ param[1].attr = TEE_PARAM_ATTR_TYPE_MEMREF_INPUT;
+ param[1].u.memref.shm = shm_buf;
+ param[1].u.memref.size = value_size;
+
+ rc = invoke_func(ops->user_data, TA_AVB_CMD_WRITE_PERSIST_VALUE,
+ 2, param);
+ if (rc)
+ goto out;
+
+out:
+ tee_shm_free(shm_buf);
+free_name:
+ tee_shm_free(shm_name);
+
+ return rc;
+}
+#endif
+