1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_BITS_H 2 #ifndef __LINUX_BITS_H
3 #define __LINUX_BITS_H 3 #define __LINUX_BITS_H
4 4
5 #include <linux/const.h> 5 #include <linux/const.h>
6 #include <vdso/bits.h> <<
7 #include <uapi/linux/bits.h> <<
8 #include <asm/bitsperlong.h> 6 #include <asm/bitsperlong.h>
9 7
>> 8 #define BIT(nr) (UL(1) << (nr))
>> 9 #define BIT_ULL(nr) (ULL(1) << (nr))
10 #define BIT_MASK(nr) (UL(1) << ((nr 10 #define BIT_MASK(nr) (UL(1) << ((nr) % BITS_PER_LONG))
11 #define BIT_WORD(nr) ((nr) / BITS_P 11 #define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
12 #define BIT_ULL_MASK(nr) (ULL(1) << ((n 12 #define BIT_ULL_MASK(nr) (ULL(1) << ((nr) % BITS_PER_LONG_LONG))
13 #define BIT_ULL_WORD(nr) ((nr) / BITS_P 13 #define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
14 #define BITS_PER_BYTE 8 14 #define BITS_PER_BYTE 8
15 15
16 /* 16 /*
17 * Create a contiguous bitmask starting at bit 17 * Create a contiguous bitmask starting at bit position @l and ending at
18 * position @h. For example 18 * position @h. For example
19 * GENMASK_ULL(39, 21) gives us the 64bit vect 19 * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
20 */ 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_ex <<
25 __is_constexpr((l) > (h)), (l) <<
26 #else <<
27 /* <<
28 * BUILD_BUG_ON_ZERO is not available in h fil <<
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) \ 21 #define GENMASK(h, l) \
35 (GENMASK_INPUT_CHECK(h, l) + __GENMASK !! 22 (((~UL(0)) - (UL(1) << (l)) + 1) & \
36 #define GENMASK_ULL(h, l) \ !! 23 (~UL(0) >> (BITS_PER_LONG - 1 - (h))))
37 (GENMASK_INPUT_CHECK(h, l) + __GENMASK <<
38 24
39 #if !defined(__ASSEMBLY__) !! 25 #define GENMASK_ULL(h, l) \
40 /* !! 26 (((~ULL(0)) - (ULL(1) << (l)) + 1) & \
41 * Missing asm support !! 27 (~ULL(0) >> (BITS_PER_LONG_LONG - 1 - (h))))
42 * <<
43 * __GENMASK_U128() depends on _BIT128() which <<
44 * in the asm code, as it shifts an 'unsigned <<
45 * type instead of direct representation of 12 <<
46 * such as long and unsigned long. The fundame <<
47 * that a 128 bit constant will get silently t <<
48 * gcc compiler. <<
49 */ <<
50 #define GENMASK_U128(h, l) \ <<
51 (GENMASK_INPUT_CHECK(h, l) + __GENMASK <<
52 #endif <<
53 28
54 #endif /* __LINUX_BITS_H */ 29 #endif /* __LINUX_BITS_H */
55 30
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