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/* 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 __ASM_ARM_SWAB_H
#define __ASM_ARM_SWAB_H
#include <linux/types.h>
#if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
# define __SWAB_64_THRU_32__
#endif
static __inline__ __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 &= ~0x00FF0000; /* bic r1,r1,#0x00FF0000 */
x ^= (t >> 8); /* eor r0,r0,r1,lsr #8 */
return x;
}
#define __arch_swab32 __arch_swab32
#endif /* __ASM_ARM_SWAB_H */
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