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| author | Yalin Wang | 2014-11-03 03:02:23 +0100 |
|---|---|---|
| committer | Russell King | 2014-12-22 17:47:32 +0100 |
| commit | 8e7a4cef71790d9406a7bd85aea6cfb12bc07d3c (patch) | |
| tree | 11f2f81b33b47bbd5d82afae69721ce98dda5f52 /arch/arm64/include | |
| parent | ARM: 8187/1: add CONFIG_HAVE_ARCH_BITREVERSE to support rbit instruction (diff) | |
| download | kernel-qcow2-linux-8e7a4cef71790d9406a7bd85aea6cfb12bc07d3c.tar.gz kernel-qcow2-linux-8e7a4cef71790d9406a7bd85aea6cfb12bc07d3c.tar.xz kernel-qcow2-linux-8e7a4cef71790d9406a7bd85aea6cfb12bc07d3c.zip | |
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>
Diffstat (limited to 'arch/arm64/include')
| -rw-r--r-- | arch/arm64/include/asm/bitrev.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/bitrev.h b/arch/arm64/include/asm/bitrev.h new file mode 100644 index 000000000000..a5a0c3660137 --- /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 |