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

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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>
This commit is contained in:
Yalin Wang 2014-11-03 03:02:23 +01:00 committed by Russell King
parent 556d2f055b
commit 8e7a4cef71
2 changed files with 20 additions and 0 deletions
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1
arch/arm64/Kconfig
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@ -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

19
arch/arm64/include/asm/bitrev.h Normal file
View File

@ -0,0 +1,19 @@
#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