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Commit 8e7a4cef authored by Yalin Wang's avatar Yalin Wang Committed by Russell King
Browse files

ARM: 8189/1: arm64:add bitrev.h file to support rbit instruction 



This patch add bitrev.h file to support rbit instruction,
so that we can do bitrev operation by hardware.

Signed-off-by: default avatarYalin Wang <yalin.wang@sonymobile.com>
Acked-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 556d2f05

arch/arm64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ config ARM64 
	select HARDIRQS_SW_RESEND

	select HAVE_ALIGNED_STRUCT_PAGE if SLUB

	select HAVE_ARCH_AUDITSYSCALL

	select HAVE_ARCH_BITREVERSE

	select HAVE_ARCH_JUMP_LABEL

	select HAVE_ARCH_KGDB

	select HAVE_ARCH_SECCOMP_FILTER

arch/arm64/include/asm/bitrev.h

0 → 100644
+19 −0
Original line number Diff line number Diff line 
#ifndef __ASM_BITREV_H

#define __ASM_BITREV_H

static __always_inline __attribute_const__ u32 __arch_bitrev32(u32 x)

{

	__asm__ ("rbit %w0, %w1" : "=r" (x) : "r" (x));

	return x;

}



static __always_inline __attribute_const__ u16 __arch_bitrev16(u16 x)

{

	return __arch_bitrev32((u32)x) >> 16;

}



static __always_inline __attribute_const__ u8 __arch_bitrev8(u8 x)

{

	return __arch_bitrev32((u32)x) >> 24;

}



#endif