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1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef __LINUX_BITS_H | |
3 | #define __LINUX_BITS_H | |
4 | #include <asm/bitsperlong.h> | |
5 | ||
6 | #define BIT(nr) (1UL << (nr)) | |
7 | #define BIT_ULL(nr) (1ULL << (nr)) | |
8 | #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) | |
9 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) | |
10 | #define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG)) | |
11 | #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG) | |
12 | #define BITS_PER_BYTE 8 | |
13 | ||
14 | /* | |
15 | * Create a contiguous bitmask starting at bit position @l and ending at | |
16 | * position @h. For example | |
17 | * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000. | |
18 | */ | |
19 | #define GENMASK(h, l) \ | |
20 | (((~0UL) - (1UL << (l)) + 1) & (~0UL >> (BITS_PER_LONG - 1 - (h)))) | |
21 | ||
22 | #define GENMASK_ULL(h, l) \ | |
23 | (((~0ULL) - (1ULL << (l)) + 1) & \ | |
24 | (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h)))) | |
25 | ||
26 | #endif /* __LINUX_BITS_H */ |