xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ARM: 8287/1: add bitrev.h file to support rbit instruction

Browse Source 
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>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Yalin Wang
2015-01-16 02:45:55 +01:00
committed by Russell King
parent 8e7a4cef71
commit 0b7857dbeb
2 changed files with 21 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
arch/arm/include/asm/bitrev.h Normal file
View File

@@ -0,0 +1,20 @@
#ifndef __ASM_BITREV_H
#define __ASM_BITREV_H
static __always_inline __attribute_const__ u32 __arch_bitrev32(u32 x)
{
__asm__ ("rbit %0, %1" : "=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