18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * arch/arm/include/asm/byteorder.h 48c2ecf20Sopenharmony_ci * 58c2ecf20Sopenharmony_ci * ARM Endian-ness. In little endian mode, the data bus is connected such 68c2ecf20Sopenharmony_ci * that byte accesses appear as: 78c2ecf20Sopenharmony_ci * 0 = d0...d7, 1 = d8...d15, 2 = d16...d23, 3 = d24...d31 88c2ecf20Sopenharmony_ci * and word accesses (data or instruction) appear as: 98c2ecf20Sopenharmony_ci * d0...d31 108c2ecf20Sopenharmony_ci * 118c2ecf20Sopenharmony_ci * When in big endian mode, byte accesses appear as: 128c2ecf20Sopenharmony_ci * 0 = d24...d31, 1 = d16...d23, 2 = d8...d15, 3 = d0...d7 138c2ecf20Sopenharmony_ci * and word accesses (data or instruction) appear as: 148c2ecf20Sopenharmony_ci * d0...d31 158c2ecf20Sopenharmony_ci */ 168c2ecf20Sopenharmony_ci#ifndef __ASM_ARM_SWAB_H 178c2ecf20Sopenharmony_ci#define __ASM_ARM_SWAB_H 188c2ecf20Sopenharmony_ci 198c2ecf20Sopenharmony_ci#include <uapi/asm/swab.h> 208c2ecf20Sopenharmony_ci 218c2ecf20Sopenharmony_ci#if __LINUX_ARM_ARCH__ >= 6 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_cistatic inline __attribute_const__ __u32 __arch_swahb32(__u32 x) 248c2ecf20Sopenharmony_ci{ 258c2ecf20Sopenharmony_ci __asm__ ("rev16 %0, %1" : "=r" (x) : "r" (x)); 268c2ecf20Sopenharmony_ci return x; 278c2ecf20Sopenharmony_ci} 288c2ecf20Sopenharmony_ci#define __arch_swahb32 __arch_swahb32 298c2ecf20Sopenharmony_ci#define __arch_swab16(x) ((__u16)__arch_swahb32(x)) 308c2ecf20Sopenharmony_ci 318c2ecf20Sopenharmony_cistatic inline __attribute_const__ __u32 __arch_swab32(__u32 x) 328c2ecf20Sopenharmony_ci{ 338c2ecf20Sopenharmony_ci __asm__ ("rev %0, %1" : "=r" (x) : "r" (x)); 348c2ecf20Sopenharmony_ci return x; 358c2ecf20Sopenharmony_ci} 368c2ecf20Sopenharmony_ci#define __arch_swab32 __arch_swab32 378c2ecf20Sopenharmony_ci 388c2ecf20Sopenharmony_ci#endif 398c2ecf20Sopenharmony_ci#endif 40