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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef __LINUX_BITS_H | |
3 | #define __LINUX_BITS_H | |
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4 | |
5 | #include <linux/const.h> | |
3945ff37 | 6 | #include <vdso/bits.h> |
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7 | #include <asm/bitsperlong.h> |
8 | ||
95b980d6 | 9 | #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) |
8bd9cb51 | 10 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
95b980d6 | 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) |
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 | */ | |
6ec4476a | 20 | #if !defined(__ASSEMBLY__) |
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21 | #include <linux/build_bug.h> |
22 | #define GENMASK_INPUT_CHECK(h, l) \ | |
23 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ | |
f747e666 | 24 | __is_constexpr((l) > (h)), (l) > (h), 0))) |
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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) \ | |
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34 | (((~UL(0)) - (UL(1) << (l)) + 1) & \ |
35 | (~UL(0) >> (BITS_PER_LONG - 1 - (h)))) | |
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36 | #define GENMASK(h, l) \ |
37 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | |
8bd9cb51 | 38 | |
295bcca8 | 39 | #define __GENMASK_ULL(h, l) \ |
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40 | (((~ULL(0)) - (ULL(1) << (l)) + 1) & \ |
41 | (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h)))) | |
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42 | #define GENMASK_ULL(h, l) \ |
43 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) | |
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44 | |
45 | #endif /* __LINUX_BITS_H */ |