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/*
* Copyright (c) 2009-2015 Richard Braun.
* 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.
* 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.
*
*
* Helper macros.
*
* Upstream site with license notes :
* http://git.sceen.net/rbraun/librbraun.git/
*/
#ifndef _KERN_MACROS_H
#define _KERN_MACROS_H
#define MACRO_BEGIN ({
#define MACRO_END })
#define MACRO_RETURN if (1) return
#define __QUOTE(x) #x
#define QUOTE(x) __QUOTE(x)
#ifdef __ASSEMBLER__
#define DECL_CONST(x, s) x
#else /* __ASSEMBLER__ */
#define __DECL_CONST(x, s) x##s
#define DECL_CONST(x, s) __DECL_CONST(x, s)
#endif /* __ASSEMBLER__ */
#define STRLEN(x) (sizeof(x) - 1)
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#define DIV_CEIL(n, d) (((n) + (d) - 1) / (d))
#define P2ALIGNED(x, a) (((x) & ((a) - 1)) == 0)
#define ISP2(x) P2ALIGNED(x, x)
#define P2ALIGN(x, a) ((x) & -(a))
#define P2ROUND(x, a) (-(-(x) & -(a)))
#define P2END(x, a) (-(~(x) & -(a)))
#define structof(ptr, type, member) \
((type *)((char *)(ptr) - offsetof(type, member)))
#define access_once(x) (*(volatile typeof(x) *)&(x))
#define alignof(x) __alignof__(x)
#ifndef likely
#define likely(expr) __builtin_expect(!!(expr), 1)
#endif /* likely */
#ifndef unlikely
#define unlikely(expr) __builtin_expect(!!(expr), 0)
#endif /* unlikely */
#ifndef barrier
#define barrier() asm volatile("" : : : "memory")
#endif /* barrier */
#define __noreturn __attribute__((noreturn))
#define __aligned(x) __attribute__((aligned(x)))
#define __always_inline inline __attribute__((always_inline))
#ifndef __section
#define __section(x) __attribute__((section(x)))
#endif /* __section */
#define __packed __attribute__((packed))
#define __alias(x) __attribute__((alias(x)))
#define __format_printf(fmt, args) \
__attribute__((format(printf, fmt, args)))
#endif /* _KERN_MACROS_H */
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