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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-06-21 15:43:21 +02:00
Jinjie Ruan
83aede8131
Define generic___bitrev8/16/32 using the implementation in <linux/bitrev.h>, so they can be reused in <asm/bitrev.h>, such as RISCV. Reviewed-by: Yury Norov <ynorov@nvidia.com> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Signed-off-by: Yury Norov <ynorov@nvidia.com>
94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_BITREV_H
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#define _LINUX_BITREV_H
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#include <linux/types.h>
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#ifdef CONFIG_HAVE_ARCH_BITREVERSE
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#include <asm/bitrev.h>
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#define __bitrev32 __arch_bitrev32
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#define __bitrev16 __arch_bitrev16
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#define __bitrev8 __arch_bitrev8
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#else
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#include <asm-generic/bitops/__bitrev.h>
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#define __bitrev32 generic___bitrev32
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#define __bitrev16 generic___bitrev16
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#define __bitrev8 generic___bitrev8
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#endif /* CONFIG_HAVE_ARCH_BITREVERSE */
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#define __bitrev8x4(x) (__bitrev32(swab32(x)))
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#define __constant_bitrev32(x) \
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({ \
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u32 ___x = x; \
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___x = (___x >> 16) | (___x << 16); \
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___x = ((___x & (u32)0xFF00FF00UL) >> 8) | ((___x & (u32)0x00FF00FFUL) << 8); \
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___x = ((___x & (u32)0xF0F0F0F0UL) >> 4) | ((___x & (u32)0x0F0F0F0FUL) << 4); \
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___x = ((___x & (u32)0xCCCCCCCCUL) >> 2) | ((___x & (u32)0x33333333UL) << 2); \
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___x = ((___x & (u32)0xAAAAAAAAUL) >> 1) | ((___x & (u32)0x55555555UL) << 1); \
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___x; \
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})
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#define __constant_bitrev16(x) \
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({ \
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u16 ___x = x; \
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___x = (___x >> 8) | (___x << 8); \
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___x = ((___x & (u16)0xF0F0U) >> 4) | ((___x & (u16)0x0F0FU) << 4); \
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___x = ((___x & (u16)0xCCCCU) >> 2) | ((___x & (u16)0x3333U) << 2); \
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___x = ((___x & (u16)0xAAAAU) >> 1) | ((___x & (u16)0x5555U) << 1); \
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___x; \
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})
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#define __constant_bitrev8x4(x) \
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({ \
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u32 ___x = x; \
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___x = ((___x & (u32)0xF0F0F0F0UL) >> 4) | ((___x & (u32)0x0F0F0F0FUL) << 4); \
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___x = ((___x & (u32)0xCCCCCCCCUL) >> 2) | ((___x & (u32)0x33333333UL) << 2); \
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___x = ((___x & (u32)0xAAAAAAAAUL) >> 1) | ((___x & (u32)0x55555555UL) << 1); \
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___x; \
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})
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#define __constant_bitrev8(x) \
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({ \
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u8 ___x = x; \
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___x = (___x >> 4) | (___x << 4); \
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___x = ((___x & (u8)0xCCU) >> 2) | ((___x & (u8)0x33U) << 2); \
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___x = ((___x & (u8)0xAAU) >> 1) | ((___x & (u8)0x55U) << 1); \
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___x; \
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})
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#define bitrev32(x) \
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({ \
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u32 __x = x; \
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__builtin_constant_p(__x) ? \
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__constant_bitrev32(__x) : \
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__bitrev32(__x); \
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})
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#define bitrev16(x) \
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({ \
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u16 __x = x; \
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__builtin_constant_p(__x) ? \
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__constant_bitrev16(__x) : \
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__bitrev16(__x); \
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})
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#define bitrev8x4(x) \
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({ \
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u32 __x = x; \
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__builtin_constant_p(__x) ? \
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__constant_bitrev8x4(__x) : \
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__bitrev8x4(__x); \
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})
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#define bitrev8(x) \
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({ \
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u8 __x = x; \
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__builtin_constant_p(__x) ? \
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__constant_bitrev8(__x) : \
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__bitrev8(__x) ; \
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})
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#endif /* _LINUX_BITREV_H */
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