30 lines
883 B
C
30 lines
883 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __LINUX_BITS_H
|
|
#define __LINUX_BITS_H
|
|
|
|
#include <linux/const.h>
|
|
#include <asm/bitsperlong.h>
|
|
|
|
#define BIT(nr) (UL(1) << (nr))
|
|
#define BIT_ULL(nr) (ULL(1) << (nr))
|
|
#define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG))
|
|
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
|
|
#define BIT_ULL_MASK(nr) (ULL(1) << ((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) \
|
|
(((~UL(0)) - (UL(1) << (l)) + 1) & \
|
|
(~UL(0) >> (BITS_PER_LONG - 1 - (h))))
|
|
|
|
#define GENMASK_ULL(h, l) \
|
|
(((~ULL(0)) - (ULL(1) << (l)) + 1) & \
|
|
(~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h))))
|
|
|
|
#endif /* __LINUX_BITS_H */
|