1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 *  arch/arm/include/asm/byteorder.h
 4 *
 5 * ARM Endian-ness.  In little endian mode, the data bus is connected such
 6 * that byte accesses appear as:
 7 *  0 = d0...d7, 1 = d8...d15, 2 = d16...d23, 3 = d24...d31
 8 * and word accesses (data or instruction) appear as:
 9 *  d0...d31
10 *
11 * When in big endian mode, byte accesses appear as:
12 *  0 = d24...d31, 1 = d16...d23, 2 = d8...d15, 3 = d0...d7
13 * and word accesses (data or instruction) appear as:
14 *  d0...d31
15 */
16#ifndef __ASM_ARM_SWAB_H
17#define __ASM_ARM_SWAB_H
18
19#include <uapi/asm/swab.h>
20
21#if __LINUX_ARM_ARCH__ >= 6
22
23static inline __attribute_const__ __u32 __arch_swahb32(__u32 x)
24{
25	__asm__ ("rev16 %0, %1" : "=r" (x) : "r" (x));
26	return x;
27}
28#define __arch_swahb32 __arch_swahb32
29#define __arch_swab16(x) ((__u16)__arch_swahb32(x))
30
31static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
32{
33	__asm__ ("rev %0, %1" : "=r" (x) : "r" (x));
34	return x;
35}
36#define __arch_swab32 __arch_swab32
37
38#endif
39#endif

 
 1/*
 2 *  arch/arm/include/asm/byteorder.h
 3 *
 4 * ARM Endian-ness.  In little endian mode, the data bus is connected such
 5 * that byte accesses appear as:
 6 *  0 = d0...d7, 1 = d8...d15, 2 = d16...d23, 3 = d24...d31
 7 * and word accesses (data or instruction) appear as:
 8 *  d0...d31
 9 *
10 * When in big endian mode, byte accesses appear as:
11 *  0 = d24...d31, 1 = d16...d23, 2 = d8...d15, 3 = d0...d7
12 * and word accesses (data or instruction) appear as:
13 *  d0...d31
14 */
15#ifndef __ASM_ARM_SWAB_H
16#define __ASM_ARM_SWAB_H
17
18#include <uapi/asm/swab.h>
19
20#if __LINUX_ARM_ARCH__ >= 6
21
22static inline __attribute_const__ __u32 __arch_swahb32(__u32 x)
23{
24	__asm__ ("rev16 %0, %1" : "=r" (x) : "r" (x));
25	return x;
26}
27#define __arch_swahb32 __arch_swahb32
28#define __arch_swab16(x) ((__u16)__arch_swahb32(x))
29
30static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
31{
32	__asm__ ("rev %0, %1" : "=r" (x) : "r" (x));
33	return x;
34}
35#define __arch_swab32 __arch_swab32
36
37#endif
38#endif