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