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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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