[mirror_ubuntu-bionic-kernel.git] / include / linux / bits.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_BITS_H
#define __LINUX_BITS_H
#include <asm/bitsperlong.h>

#define BIT(nr)			(1UL << (nr))
#define BIT_ULL(nr)		(1ULL << (nr))
#define BIT_MASK(nr)		(1UL << ((nr) % BITS_PER_LONG))
#define BIT_WORD(nr)		((nr) / BITS_PER_LONG)
#define BIT_ULL_MASK(nr)	(1ULL << ((nr) % BITS_PER_LONG_LONG))
#define BIT_ULL_WORD(nr)	((nr) / BITS_PER_LONG_LONG)
#define BITS_PER_BYTE		8

/*
 * Create a contiguous bitmask starting at bit position @l and ending at
 * position @h. For example
 * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
 */
#define GENMASK(h, l) \
	(((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h))))

#define GENMASK_ULL(h, l) \
	(((~0ULL) - (1ULL << (l)) + 1) & \
	 (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))

#endif	/* __LINUX_BITS_H */
Commit	Line	Data
cd913db1 WD	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef __LINUX_BITS_H
	3	#define __LINUX_BITS_H
	4	#include <asm/bitsperlong.h>
	5
	6	#define BIT(nr) (1UL << (nr))
	7	#define BIT_ULL(nr) (1ULL << (nr))
	8	#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
	9	#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
	10	#define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG))
	11	#define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
	12	#define BITS_PER_BYTE 8
	13
	14	/*
	15	* Create a contiguous bitmask starting at bit position @l and ending at
	16	* position @h. For example
	17	* GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
	18	*/
	19	#define GENMASK(h, l) \
	20	(((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
	21
	22	#define GENMASK_ULL(h, l) \
	23	(((~0ULL) - (1ULL << (l)) + 1) & \
	24	(~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))
	25
	26	#endif /* __LINUX_BITS_H */