1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun #ifndef __LINUX_BITS_H 3*4882a593Smuzhiyun #define __LINUX_BITS_H 4*4882a593Smuzhiyun 5*4882a593Smuzhiyun #include <linux/const.h> 6*4882a593Smuzhiyun #include <vdso/bits.h> 7*4882a593Smuzhiyun #include <asm/bitsperlong.h> 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #define BIT_ULL(nr) (ULL(1) << (nr)) 10*4882a593Smuzhiyun #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) 11*4882a593Smuzhiyun #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) 12*4882a593Smuzhiyun #define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG)) 13*4882a593Smuzhiyun #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) 14*4882a593Smuzhiyun #define BITS_PER_BYTE 8 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun /* 17*4882a593Smuzhiyun * Create a contiguous bitmask starting at bit position @l and ending at 18*4882a593Smuzhiyun * position @h. For example 19*4882a593Smuzhiyun * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000. 20*4882a593Smuzhiyun */ 21*4882a593Smuzhiyun #if !defined(__ASSEMBLY__) 22*4882a593Smuzhiyun #include <linux/build_bug.h> 23*4882a593Smuzhiyun #define GENMASK_INPUT_CHECK(h, l) \ 24*4882a593Smuzhiyun (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ 25*4882a593Smuzhiyun __is_constexpr((l) > (h)), (l) > (h), 0))) 26*4882a593Smuzhiyun #else 27*4882a593Smuzhiyun /* 28*4882a593Smuzhiyun * BUILD_BUG_ON_ZERO is not available in h files included from asm files, 29*4882a593Smuzhiyun * disable the input check if that is the case. 30*4882a593Smuzhiyun */ 31*4882a593Smuzhiyun #define GENMASK_INPUT_CHECK(h, l) 0 32*4882a593Smuzhiyun #endif 33*4882a593Smuzhiyun 34*4882a593Smuzhiyun #define __GENMASK(h, l) \ 35*4882a593Smuzhiyun (((~UL(0)) - (UL(1) << (l)) + 1) & \ 36*4882a593Smuzhiyun (~UL(0) >> (BITS_PER_LONG - 1 - (h)))) 37*4882a593Smuzhiyun #define GENMASK(h, l) \ 38*4882a593Smuzhiyun (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun #define __GENMASK_ULL(h, l) \ 41*4882a593Smuzhiyun (((~ULL(0)) - (ULL(1) << (l)) + 1) & \ 42*4882a593Smuzhiyun (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h)))) 43*4882a593Smuzhiyun #define GENMASK_ULL(h, l) \ 44*4882a593Smuzhiyun (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun #endif /* __LINUX_BITS_H */ 47