/* util.h - misc utilities */

/*
 * Copyright (c) 2011-2014, Wind River Systems, Inc.
 *
 * 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.
 *
 * 3) Neither the name of Wind River Systems nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
 */

/*
DESCRIPTION
Misc utilities usable by nanokernel, microkernel, and application code.
 */

#ifndef _UTIL__H_
#define _UTIL__H_

#ifdef __cplusplus
extern "C" {
#endif

#ifndef _ASMLANGUAGE

/* Helper to pass a int as a pointer or vice-versa.
 * Those are available for 32 bits architectures: */
#define POINTER_TO_UINT(x) ((uint32_t) (x))
#define UINT_TO_POINTER(x) ((void *) (x))
#define POINTER_TO_INT(x)  ((int32_t) (x))
#define INT_TO_POINTER(x)  ((void *) (x))

#define ARRAY_SIZE(array) ((unsigned long)(sizeof(array) / sizeof((array)[0])))
#define CONTAINER_OF(ptr, type, field) \
	((type *)(((char *)(ptr)) - offsetof(type, field)))

/* round "x" up/down to next multiple of "align" (which must be a power of 2) */
#define ROUND_UP(x, align)                                   \
	(((unsigned long)(x) + ((unsigned long)align - 1)) & \
	 ~((unsigned long)align - 1))
#define ROUND_DOWN(x, align) ((unsigned long)(x) & ~((unsigned long)align - 1))

#ifdef INLINED
#define INLINE inline
#else
#define INLINE
#endif

#ifndef max
#define max(a, b) (((a) > (b)) ? (a) : (b))
#endif

#ifndef min
#define min(a, b) (((a) < (b)) ? (a) : (b))
#endif

static inline int is_power_of_two(unsigned int x)
{
	return (x != 0) && !(x & (x - 1));
}
#endif /* !_ASMLANGUAGE */

/* KB, MB, GB */
#define KB(x) ((x) << 10)
#define MB(x) (KB(x) << 10)
#define GB(x) (MB(x) << 10)

/* KHZ, MHZ */
#define KHZ(x) ((x) * 1000)
#define MHZ(x) (KHZ(x) * 1000)

#ifdef __cplusplus
}
#endif

#endif /* _UTIL__H_ */