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