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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _LINUX_BITREV_H3#define _LINUX_BITREV_H4 5#include <linux/types.h>6 7#ifdef CONFIG_HAVE_ARCH_BITREVERSE8#include <asm/bitrev.h>9 10#define __bitrev32 __arch_bitrev3211#define __bitrev16 __arch_bitrev1612#define __bitrev8 __arch_bitrev813 14#else15extern u8 const byte_rev_table[256];16static inline u8 __bitrev8(u8 byte)17{18 return byte_rev_table[byte];19}20 21static inline u16 __bitrev16(u16 x)22{23 return (__bitrev8(x & 0xff) << 8) | __bitrev8(x >> 8);24}25 26static inline u32 __bitrev32(u32 x)27{28 return (__bitrev16(x & 0xffff) << 16) | __bitrev16(x >> 16);29}30 31#endif /* CONFIG_HAVE_ARCH_BITREVERSE */32 33#define __bitrev8x4(x) (__bitrev32(swab32(x)))34 35#define __constant_bitrev32(x) \36({ \37 u32 ___x = 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); \43 ___x; \44})45 46#define __constant_bitrev16(x) \47({ \48 u16 ___x = 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); \53 ___x; \54})55 56#define __constant_bitrev8x4(x) \57({ \58 u32 ___x = 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); \62 ___x; \63})64 65#define __constant_bitrev8(x) \66({ \67 u8 ___x = 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); \71 ___x; \72})73 74#define bitrev32(x) \75({ \76 u32 __x = x; \77 __builtin_constant_p(__x) ? \78 __constant_bitrev32(__x) : \79 __bitrev32(__x); \80})81 82#define bitrev16(x) \83({ \84 u16 __x = x; \85 __builtin_constant_p(__x) ? \86 __constant_bitrev16(__x) : \87 __bitrev16(__x); \88 })89 90#define bitrev8x4(x) \91({ \92 u32 __x = x; \93 __builtin_constant_p(__x) ? \94 __constant_bitrev8x4(__x) : \95 __bitrev8x4(__x); \96 })97 98#define bitrev8(x) \99({ \100 u8 __x = x; \101 __builtin_constant_p(__x) ? \102 __constant_bitrev8(__x) : \103 __bitrev8(__x) ; \104 })105#endif /* _LINUX_BITREV_H */106