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 */ 27
