common.h

 *    stack buffers with this macro you need to make sure you remove the & from
 *    the locations where you are taking the address of the buffer.
 *
 * Note that the size parameter is the number of array elements to allocate,
 * not the number of bytes.
 *
 * This macro can not be used outside of function scope, or for the creation
 * of a function scoped static buffer.  It can not be used to create a cache
 * line aligned global buffer.
 */
#define PAD_COUNT(s, pad) ((s - 1) / pad + 1)
#define PAD_SIZE(s, pad) (PAD_COUNT(s, pad) * pad)
#define ALLOC_ALIGN_BUFFER_PAD(type, name, size, align, pad)		\
	char __##name[ROUND(PAD_SIZE(size * sizeof(type), pad), align)  \
		      + (align - 1)];					\
									\
	type *name = (type *) ALIGN((uintptr_t)__##name, align)
#define ALLOC_ALIGN_BUFFER(type, name, size, align)		\
	ALLOC_ALIGN_BUFFER_PAD(type, name, size, align, 1)
#define ALLOC_CACHE_ALIGN_BUFFER_PAD(type, name, size, pad)		\
	ALLOC_ALIGN_BUFFER_PAD(type, name, size, ARCH_DMA_MINALIGN, pad)
#define ALLOC_CACHE_ALIGN_BUFFER(type, name, size)			\
	ALLOC_ALIGN_BUFFER(type, name, size, ARCH_DMA_MINALIGN)

/*
 * DEFINE_CACHE_ALIGN_BUFFER() is similar to ALLOC_CACHE_ALIGN_BUFFER, but it's
 * purpose is to allow allocating aligned buffers outside of function scope.
 * Usage of this macro shall be avoided or used with extreme care!
 */
#define DEFINE_ALIGN_BUFFER(type, name, size, align)			\
	static char __##name[roundup(size * sizeof(type), align)]	\
			__aligned(align);				\
									\
	static type *name = (type *)__##name
#define DEFINE_CACHE_ALIGN_BUFFER(type, name, size)			\
	DEFINE_ALIGN_BUFFER(type, name, size, ARCH_DMA_MINALIGN)

/* Pull in stuff for the build system */
#ifdef DO_DEPS_ONLY
# include <environment.h>
#endif

#endif	/* __COMMON_H_ */