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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> | |
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6 | #include <asm/bitsperlong.h> |
7 | ||
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8 | #define BIT(nr) (UL(1) << (nr)) |
9 | #define BIT_ULL(nr) (ULL(1) << (nr)) | |
10 | #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) | |
8bd9cb51 | 11 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
95b980d6 | 12 | #define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG)) |
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13 | #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) |
14 | #define BITS_PER_BYTE 8 | |
15 | ||
16 | /* | |
17 | * Create a contiguous bitmask starting at bit position @l and ending at | |
18 | * position @h. For example | |
19 | * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000. | |
20 | */ | |
21 | #define GENMASK(h, l) \ | |
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22 | (((~UL(0)) - (UL(1) << (l)) + 1) & \ |
23 | (~UL(0) >> (BITS_PER_LONG - 1 - (h)))) | |
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24 | |
25 | #define GENMASK_ULL(h, l) \ | |
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26 | (((~ULL(0)) - (ULL(1) << (l)) + 1) & \ |
27 | (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h)))) | |
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28 | |
29 | #endif /* __LINUX_BITS_H */ |