1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LINUX_BITS_H 3 #define __LINUX_BITS_H 4 5 #include <linux/const.h> 6 #include <asm/bitsperlong.h> 7 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 15 16 /* 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. 20 */ 21 #define GENMASK(h, l) \ 22 (((~UL(0)) - (UL(1) << (l)) + 1) & \ 23 (~UL(0) >> (BITS_PER_LONG - 1 - (h)))) 24 25 #define GENMASK_ULL(h, l) \ 26 (((~ULL(0)) - (ULL(1) << (l)) + 1) & \ 27 (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h)))) 28 29 #endif /* __LINUX_BITS_H */ 30