1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef __LINUX_BITS_H |
3 | #define __LINUX_BITS_H |
4 | |
5 | #include <linux/const.h> |
6 | #include <vdso/bits.h> |
7 | #include <uapi/linux/bits.h> |
8 | #include <asm/bitsperlong.h> |
9 | |
10 | #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) |
11 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
12 | #define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG)) |
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 | #if !defined(__ASSEMBLY__) |
22 | #include <linux/build_bug.h> |
23 | #define GENMASK_INPUT_CHECK(h, l) \ |
24 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ |
25 | __is_constexpr((l) > (h)), (l) > (h), 0))) |
26 | #else |
27 | /* |
28 | * BUILD_BUG_ON_ZERO is not available in h files included from asm files, |
29 | * disable the input check if that is the case. |
30 | */ |
31 | #define GENMASK_INPUT_CHECK(h, l) 0 |
32 | #endif |
33 | |
34 | #define GENMASK(h, l) \ |
35 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) |
36 | #define GENMASK_ULL(h, l) \ |
37 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) |
38 | |
39 | #endif /* __LINUX_BITS_H */ |
40 | |