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Commit 40f5b078 authored by Rabin Vincent's avatar Rabin Vincent Committed by Russell King
Browse files

ARM: 5772/1: Use REV and REV16 for byte swapping on ARMv6+ 



ARMv6 introduced the REV and REV16 instructions that reverse bytes in
words and halfwords.  Use them for the arch-specific implementation of
the byte swapping helpers on ARMv6+.

Signed-off-by: default avatarRabin Vincent <rabin@rab.in>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent a8cf81ff

arch/arm/include/asm/swab.h

+19 −0
Original line number Diff line number Diff line
@@ -22,6 +22,24 @@ 
#  define __SWAB_64_THRU_32__

#endif



#if defined(__KERNEL__) && __LINUX_ARM_ARCH__ >= 6



static inline __attribute_const__ __u16 __arch_swab16(__u16 x)

{

	__asm__ ("rev16 %0, %1" : "=r" (x) : "r" (x));

	return x;

}

#define __arch_swab16 __arch_swab16



static inline __attribute_const__ __u32 __arch_swab32(__u32 x)

{

	__asm__ ("rev %0, %1" : "=r" (x) : "r" (x));

	return x;

}

#define __arch_swab32 __arch_swab32



#else



static inline __attribute_const__ __u32 __arch_swab32(__u32 x)

{

	__u32 t;
@@ -48,3 +66,4 @@ static inline __attribute_const__ __u32 __arch_swab32(__u32 x) 


#endif



#endif