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8e7a4cef71
This patch add bitrev.h file to support rbit instruction, so that we can do bitrev operation by hardware. Signed-off-by: Yalin Wang <yalin.wang@sonymobile.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
20 lines
413 B
C
20 lines
413 B
C
#ifndef __ASM_BITREV_H
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#define __ASM_BITREV_H
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static __always_inline __attribute_const__ u32 __arch_bitrev32(u32 x)
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{
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__asm__ ("rbit %w0, %w1" : "=r" (x) : "r" (x));
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return x;
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}
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static __always_inline __attribute_const__ u16 __arch_bitrev16(u16 x)
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{
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return __arch_bitrev32((u32)x) >> 16;
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}
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static __always_inline __attribute_const__ u8 __arch_bitrev8(u8 x)
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{
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return __arch_bitrev32((u32)x) >> 24;
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}
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#endif
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