]>
Commit | Line | Data |
---|---|---|
ba4aa02b ACM |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef __LINUX_BITS_H | |
3 | #define __LINUX_BITS_H | |
b6589117 ACM |
4 | |
5 | #include <linux/const.h> | |
e3698b23 | 6 | #include <vdso/bits.h> |
ba4aa02b ACM |
7 | #include <asm/bitsperlong.h> |
8 | ||
b6589117 ACM |
9 | #define BIT_ULL(nr) (ULL(1) << (nr)) |
10 | #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG)) | |
ba4aa02b | 11 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) |
b6589117 | 12 | #define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG)) |
ba4aa02b ACM |
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 | */ | |
e3698b23 ACM |
21 | #if !defined(__ASSEMBLY__) && \ |
22 | (!defined(CONFIG_CC_IS_GCC) || CONFIG_GCC_VERSION >= 49000) | |
23 | #include <linux/build_bug.h> | |
24 | #define GENMASK_INPUT_CHECK(h, l) \ | |
25 | (BUILD_BUG_ON_ZERO(__builtin_choose_expr( \ | |
26 | __builtin_constant_p((l) > (h)), (l) > (h), 0))) | |
27 | #else | |
28 | /* | |
29 | * BUILD_BUG_ON_ZERO is not available in h files included from asm files, | |
30 | * disable the input check if that is the case. | |
31 | */ | |
32 | #define GENMASK_INPUT_CHECK(h, l) 0 | |
33 | #endif | |
34 | ||
35 | #define __GENMASK(h, l) \ | |
b6589117 ACM |
36 | (((~UL(0)) - (UL(1) << (l)) + 1) & \ |
37 | (~UL(0) >> (BITS_PER_LONG - 1 - (h)))) | |
e3698b23 ACM |
38 | #define GENMASK(h, l) \ |
39 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l)) | |
ba4aa02b | 40 | |
e3698b23 | 41 | #define __GENMASK_ULL(h, l) \ |
b6589117 ACM |
42 | (((~ULL(0)) - (ULL(1) << (l)) + 1) & \ |
43 | (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h)))) | |
e3698b23 ACM |
44 | #define GENMASK_ULL(h, l) \ |
45 | (GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l)) | |
ba4aa02b ACM |
46 | |
47 | #endif /* __LINUX_BITS_H */ |