original/uapi/linux/uuid.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 * UUID/GUID definition
 *
 * Copyright (C) 2010, Intel Corp.
 *	Huang Ying <ying.huang@intel.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#ifndef _UAPI_LINUX_UUID_H_
#define _UAPI_LINUX_UUID_H_

#include <linux/types.h>
#include <linux/string.h>

typedef struct {
	__u8 b[16];
} guid_t;

#define GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)			\
((guid_t)								\
{{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
   (b) & 0xff, ((b) >> 8) & 0xff,					\
   (c) & 0xff, ((c) >> 8) & 0xff,					\
   (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})

/* backwards compatibility, don't use in new code */
typedef guid_t uuid_le;
#define UUID_LE(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)		\
	GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)
#define NULL_UUID_LE							\
	UUID_LE(0x00000000, 0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00,	\
	     0x00, 0x00, 0x00, 0x00)

#endif /* _UAPI_LINUX_UUID_H_ */