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> 73c7a8e19SPaolo Bonzini #include <uapi/linux/bits.h> 88bd9cb51SWill Deacon #include <asm/bitsperlong.h> 98bd9cb51SWill Deacon 1095b980d6SMasahiro Yamada #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) 118bd9cb51SWill Deacon #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) 1295b980d6SMasahiro Yamada #define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG)) 138bd9cb51SWill Deacon #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) 148bd9cb51SWill Deacon #define BITS_PER_BYTE 8 158bd9cb51SWill Deacon 168bd9cb51SWill Deacon /* 178bd9cb51SWill Deacon * Create a contiguous bitmask starting at bit position @l and ending at 188bd9cb51SWill Deacon * position @h. For example 198bd9cb51SWill Deacon * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000. 208bd9cb51SWill Deacon */ 216ec4476aSLinus Torvalds #if !defined(__ASSEMBLY__) 22295bcca8SRikard Falkeborn #include <linux/build_bug.h> 234463a445SVincent Mailhol #include <linux/compiler.h> 244463a445SVincent Mailhol #define GENMASK_INPUT_CHECK(h, l) BUILD_BUG_ON_ZERO(const_true((l) > (h))) 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) \ 34295bcca8SRikard Falkeborn (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) 35295bcca8SRikard Falkeborn #define GENMASK_ULL(h, l) \ 36295bcca8SRikard Falkeborn (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) 378bd9cb51SWill Deacon 38947697c6SAnshuman Khandual #if !defined(__ASSEMBLY__) 39947697c6SAnshuman Khandual /* 40947697c6SAnshuman Khandual * Missing asm support 41947697c6SAnshuman Khandual * 42947697c6SAnshuman Khandual * __GENMASK_U128() depends on _BIT128() which would not work 43*0312e94aSVincent Mailhol * in the asm code, as it shifts an 'unsigned __int128' data 44947697c6SAnshuman Khandual * type instead of direct representation of 128 bit constants 45947697c6SAnshuman Khandual * such as long and unsigned long. The fundamental problem is 46947697c6SAnshuman Khandual * that a 128 bit constant will get silently truncated by the 47947697c6SAnshuman Khandual * gcc compiler. 48947697c6SAnshuman Khandual */ 49947697c6SAnshuman Khandual #define GENMASK_U128(h, l) \ 50947697c6SAnshuman Khandual (GENMASK_INPUT_CHECK(h, l) + __GENMASK_U128(h, l)) 51947697c6SAnshuman Khandual #endif 52947697c6SAnshuman Khandual 538bd9cb51SWill Deacon #endif /* __LINUX_BITS_H */ 54