mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 06:12:08 +00:00
8e7a4cef71
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>
20 lines
413 B
C
20 lines
413 B
C
#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
|