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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_BITREV_H
3 #define _LINUX_BITREV_H
5 #include <linux/types.h>
7 #ifdef CONFIG_HAVE_ARCH_BITREVERSE
8 #include <asm/bitrev.h>
10 #define __bitrev32 __arch_bitrev32
11 #define __bitrev16 __arch_bitrev16
12 #define __bitrev8 __arch_bitrev8
15 extern u8
const byte_rev_table
[256];
16 static inline u8
__bitrev8(u8 byte
)
18 return byte_rev_table
[byte
];
21 static inline u16
__bitrev16(u16 x
)
23 return (__bitrev8(x
& 0xff) << 8) | __bitrev8(x
>> 8);
26 static inline u32
__bitrev32(u32 x
)
28 return (__bitrev16(x
& 0xffff) << 16) | __bitrev16(x
>> 16);
31 #endif /* CONFIG_HAVE_ARCH_BITREVERSE */
33 #define __bitrev8x4(x) (__bitrev32(swab32(x)))
35 #define __constant_bitrev32(x) \
38 ___x = (___x >> 16) | (___x << 16); \
39 ___x = ((___x & (u32)0xFF00FF00UL) >> 8) | ((___x & (u32)0x00FF00FFUL) << 8); \
40 ___x = ((___x & (u32)0xF0F0F0F0UL) >> 4) | ((___x & (u32)0x0F0F0F0FUL) << 4); \
41 ___x = ((___x & (u32)0xCCCCCCCCUL) >> 2) | ((___x & (u32)0x33333333UL) << 2); \
42 ___x = ((___x & (u32)0xAAAAAAAAUL) >> 1) | ((___x & (u32)0x55555555UL) << 1); \
46 #define __constant_bitrev16(x) \
49 ___x = (___x >> 8) | (___x << 8); \
50 ___x = ((___x & (u16)0xF0F0U) >> 4) | ((___x & (u16)0x0F0FU) << 4); \
51 ___x = ((___x & (u16)0xCCCCU) >> 2) | ((___x & (u16)0x3333U) << 2); \
52 ___x = ((___x & (u16)0xAAAAU) >> 1) | ((___x & (u16)0x5555U) << 1); \
56 #define __constant_bitrev8x4(x) \
59 ___x = ((___x & (u32)0xF0F0F0F0UL) >> 4) | ((___x & (u32)0x0F0F0F0FUL) << 4); \
60 ___x = ((___x & (u32)0xCCCCCCCCUL) >> 2) | ((___x & (u32)0x33333333UL) << 2); \
61 ___x = ((___x & (u32)0xAAAAAAAAUL) >> 1) | ((___x & (u32)0x55555555UL) << 1); \
65 #define __constant_bitrev8(x) \
68 ___x = (___x >> 4) | (___x << 4); \
69 ___x = ((___x & (u8)0xCCU) >> 2) | ((___x & (u8)0x33U) << 2); \
70 ___x = ((___x & (u8)0xAAU) >> 1) | ((___x & (u8)0x55U) << 1); \
77 __builtin_constant_p(__x) ? \
78 __constant_bitrev32(__x) : \
85 __builtin_constant_p(__x) ? \
86 __constant_bitrev16(__x) : \
90 #define bitrev8x4(x) \
93 __builtin_constant_p(__x) ? \
94 __constant_bitrev8x4(__x) : \
101 __builtin_constant_p(__x) ? \
102 __constant_bitrev8(__x) : \
105 #endif /* _LINUX_BITREV_H */