/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
* arch / arm / include / asm / byteorder . h
*
* ARM Endian - ness . In little endian mode , the data bus is connected such
* that byte accesses appear as :
* 0 = d0 . . . d7 , 1 = d8 . . . d15 , 2 = d16 . . . d23 , 3 = d24 . . . d31
* and word accesses ( data or instruction ) appear as :
* d0 . . . d31
*
* When in big endian mode , byte accesses appear as :
* 0 = d24 . . . d31 , 1 = d16 . . . d23 , 2 = d8 . . . d15 , 3 = d0 . . . d7
* and word accesses ( data or instruction ) appear as :
* d0 . . . d31
*/
#ifndef _UAPI__ASM_ARM_SWAB_H
#define _UAPI__ASM_ARM_SWAB_H
#include <linux/compiler.h>
#include <linux/types.h>
#if !defined (__STRICT_ANSI__) || defined (__KERNEL__)
# define __SWAB_64_THRU_32__
#endif
#if !defined (__KERNEL__) || __LINUX_ARM_ARCH__ < 6
static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
{
__u32 t;
#ifndef __thumb__
if (!__builtin_constant_p(x)) {
/*
* The compiler needs a bit of a hint here to always do the
* right thing and not screw it up to different degrees
* depending on the gcc version .
*/
asm ("eor\t%0, %1, %1, ror #16" : "=r" (t) : "r" (x));
} else
#endif
t = x ^ ((x << 16 ) | (x >> 16 )); /* eor r1,r0,r0,ror #16 */
x = (x << 24 ) | (x >> 8 ); /* mov r0,r0,ror #8 */
t &= ~0 x00FF0000; /* bic r1,r1,#0x00FF0000 */
x ^= (t >> 8 ); /* eor r0,r0,r1,lsr #8 */
return x;
}
#define __arch_swab32 __arch_swab32
#endif
#endif /* _UAPI__ASM_ARM_SWAB_H */
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