18bd9cb51SWill Deacon /* SPDX-License-Identifier: GPL-2.0 */ 28bd9cb51SWill Deacon #ifndef __LINUX_BITS_H 38bd9cb51SWill Deacon #define __LINUX_BITS_H 495b980d6SMasahiro Yamada 595b980d6SMasahiro Yamada #include <linux/const.h> 63945ff37SVincenzo Frascino #include <vdso/bits.h> 78bd9cb51SWill Deacon #include <asm/bitsperlong.h> 88bd9cb51SWill Deacon 995b980d6SMasahiro Yamada #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) 108bd9cb51SWill Deacon #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) 1195b980d6SMasahiro Yamada #define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG)) 128bd9cb51SWill Deacon #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) 138bd9cb51SWill Deacon #define BITS_PER_BYTE 8 148bd9cb51SWill Deacon 158bd9cb51SWill Deacon /* 168bd9cb51SWill Deacon * Create a contiguous bitmask starting at bit position @l and ending at 178bd9cb51SWill Deacon * position @h. For example 188bd9cb51SWill Deacon * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000. 198bd9cb51SWill Deacon */ 206ec4476aSLinus Torvalds #if !defined(__ASSEMBLY__) 21295bcca8SRikard Falkeborn #include <linux/build_bug.h> 22295bcca8SRikard Falkeborn #define GENMASK_INPUT_CHECK(h, l) \ 23295bcca8SRikard Falkeborn (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ 24*f747e666SRikard Falkeborn __is_constexpr((l) > (h)), (l) > (h), 0))) 25295bcca8SRikard Falkeborn #else 26295bcca8SRikard Falkeborn /* 27295bcca8SRikard Falkeborn * BUILD_BUG_ON_ZERO is not available in h files included from asm files, 28295bcca8SRikard Falkeborn * disable the input check if that is the case. 29295bcca8SRikard Falkeborn */ 30295bcca8SRikard Falkeborn #define GENMASK_INPUT_CHECK(h, l) 0 31295bcca8SRikard Falkeborn #endif 32295bcca8SRikard Falkeborn 33295bcca8SRikard Falkeborn #define __GENMASK(h, l) \ 3495b980d6SMasahiro Yamada (((~UL(0)) - (UL(1) << (l)) + 1) & \ 3595b980d6SMasahiro Yamada (~UL(0) >> (BITS_PER_LONG - 1 - (h)))) 36295bcca8SRikard Falkeborn #define GENMASK(h, l) \ 37295bcca8SRikard Falkeborn (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) 388bd9cb51SWill Deacon 39295bcca8SRikard Falkeborn #define __GENMASK_ULL(h, l) \ 4095b980d6SMasahiro Yamada (((~ULL(0)) - (ULL(1) << (l)) + 1) & \ 4195b980d6SMasahiro Yamada (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h)))) 42295bcca8SRikard Falkeborn #define GENMASK_ULL(h, l) \ 43295bcca8SRikard Falkeborn (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) 448bd9cb51SWill Deacon 458bd9cb51SWill Deacon #endif /* __LINUX_BITS_H */ 46