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+/*-
+ * Copyright (c) 2017 Netflix, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer
+ * in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _EFIVAR_DP_H_
+#define _EFIVAR_DP_H_
+
+/*
+ * "Linux compatible" efivar-dp.h header. At the moment, it's really a
+ * very thin, minimal interface.
+ */
+
+/*
+ * Generic EFI_DEVICE_PATH, spelled the Linux way. We use this
+ * interface to the outside world and type-pun to the EFI EDK2 code
+ * we use to implement it.
+ */
+typedef struct {
+ uint8_t type;
+ uint8_t subtype;
+ uint16_t length;
+} __packed efidp_header;
+
+/* NB: Linux has shadow types for all dp type */
+
+typedef union {
+ efidp_header header;
+} efidp_data;
+typedef efidp_data *efidp;
+typedef const efidp_data *const_efidp;
+
+/** format a device path into UEFI standard conforming output.
+ *
+ * NB: FreeBSD's implementation is taken from EDK2, while Linux's
+ * was hand-rolled. There may be differences as a result.
+ */
+ssize_t efidp_format_device_path(char *buf, size_t len, const_efidp dp,
+ ssize_t max);
+ssize_t efidp_parse_device_path(char *path, efidp out, size_t max);
+
+#endif /* _EFIVAR_DP_H_ */