regfield.h File Reference

Macros to help dealing with register fields. More...

#include <sys/cdefs.h>

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Macros
#define	BIT(bit)   (1u << (bit))
	Create a mask with a bit set.
#define	GENMASK(h, l)   ((0xffffffff << (l)) & (0xffffffff >> (31 - (h))))
	Create a mask with a range of bits set.
#define	FIELD_GET(var, field)    (((var) & (field)) >> __builtin_ctz(field))
	Extract a field value from a variable.
#define	FIELD_PREP(field, value)    (((value) << __builtin_ctz(field)) & (field))
	Prepare a field with a given value.

Detailed Description

Macros to help dealing with register fields.

Author

Paul Cercueil