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 <asm/bitsperlong.h> |
8 | |
9 | #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) |
10 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
11 | #define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG)) |
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 | */ |
20 | #if !defined(__ASSEMBLY__) |
21 | #include <linux/build_bug.h> |
22 | #define GENMASK_INPUT_CHECK(h, l) \ |
23 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ |
24 | __is_constexpr((l) > (h)), (l) > (h), 0))) |
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) \ |
34 | (((~UL(0)) - (UL(1) << (l)) + 1) & \ |
35 | (~UL(0) >> (BITS_PER_LONG - 1 - (h)))) |
36 | #define GENMASK(h, l) \ |
37 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) |
38 | |
39 | #define __GENMASK_ULL(h, l) \ |
40 | (((~ULL(0)) - (ULL(1) << (l)) + 1) & \ |
41 | (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h)))) |
42 | #define GENMASK_ULL(h, l) \ |
43 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) |
44 | |
45 | #endif /* __LINUX_BITS_H */ |
46 | |