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 <vdso/bits.h> 7 #include <asm/bitsperlong.h> 8 9 #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) 10 #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) 11 #define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG)) 12 #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) 13 #define BITS_PER_BYTE 8 14 15 /* 16 * Create a contiguous bitmask starting at bit position @l and ending at 17 * position @h. For example 18 * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000. 19 */ 20 #if !defined(__ASSEMBLY__) 21 #include <linux/build_bug.h> 22 #define GENMASK_INPUT_CHECK(h, l) \ 23 (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ 24 __is_constexpr((l) > (h)), (l) > (h), 0))) 25 #else 26 /* 27 * BUILD_BUG_ON_ZERO is not available in h files included from asm files, 28 * disable the input check if that is the case. 29 */ 30 #define GENMASK_INPUT_CHECK(h, l) 0 31 #endif 32 33 #define __GENMASK(h, l) \ 34 (((~UL(0)) - (UL(1) << (l)) + 1) & \ 35 (~UL(0) >> (BITS_PER_LONG - 1 - (h)))) 36 #define GENMASK(h, l) \ 37 (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) 38 39 #define __GENMASK_ULL(h, l) \ 40 (((~ULL(0)) - (ULL(1) << (l)) + 1) & \ 41 (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h)))) 42 #define GENMASK_ULL(h, l) \ 43 (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) 44 45 #endif /* __LINUX_BITS_H */ 46