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| author | Yalin Wang <Yalin.Wang@sonymobile.com> | 2014-11-03 02:02:23 (GMT) |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-12-22 16:47:32 (GMT) |
| commit | 8e7a4cef71790d9406a7bd85aea6cfb12bc07d3c (patch) | |
| tree | 11f2f81b33b47bbd5d82afae69721ce98dda5f52 | |
| parent | 556d2f055bf6d79ce81587dfe774d4dd10da473f (diff) | |
| download | linux-8e7a4cef71790d9406a7bd85aea6cfb12bc07d3c.tar.xz | |
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: 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>
| -rw-r--r-- | arch/arm64/Kconfig | 1 | ||||
| -rw-r--r-- | arch/arm64/include/asm/bitrev.h | 19 |
2 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index b1f9a20..0ed36d1 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -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 diff --git a/arch/arm64/include/asm/bitrev.h b/arch/arm64/include/asm/bitrev.h new file mode 100644 index 0000000..a5a0c36 --- /dev/null +++ b/arch/arm64/include/asm/bitrev.h @@ -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 |