1c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 2c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * linux/include/asm-arm/byteorder.h 3c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 4c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * ARM Endian-ness. In little endian mode, the data bus is connected such 5c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * that byte accesses appear as: 6c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 0 = d0...d7, 1 = d8...d15, 2 = d16...d23, 3 = d24...d31 7c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * and word accesses (data or instruction) appear as: 8c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * d0...d31 9c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 10c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * When in big endian mode, byte accesses appear as: 11c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 0 = d24...d31, 1 = d16...d23, 2 = d8...d15, 3 = d0...d7 12c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * and word accesses (data or instruction) appear as: 13c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * d0...d31 14c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 15c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef __ASM_ARM_BYTEORDER_H 16c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define __ASM_ARM_BYTEORDER_H 17c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 18c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/compiler.h> 19c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <asm/types.h> 20c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 21c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline __attribute_const__ __u32 ___arch__swab32(__u32 x) 22c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 23c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru __u32 t; 24c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 25c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef __thumb__ 26c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (!__builtin_constant_p(x)) { 27c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 28c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The compiler needs a bit of a hint here to always do the 29c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * right thing and not screw it up to different degrees 30c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * depending on the gcc version. 31c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 32c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru asm ("eor\t%0, %1, %1, ror #16" : "=r" (t) : "r" (x)); 33c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru } else 34c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 35c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru t = x ^ ((x << 16) | (x >> 16)); /* eor r1,r0,r0,ror #16 */ 36c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 37c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru x = (x << 24) | (x >> 8); /* mov r0,r0,ror #8 */ 38c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru t &= ~0x00FF0000; /* bic r1,r1,#0x00FF0000 */ 39c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru x ^= (t >> 8); /* eor r0,r0,r1,lsr #8 */ 40c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 41c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return x; 42c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 43c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 44c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define __arch__swab32(x) ___arch__swab32(x) 45c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 46c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#if !defined(__STRICT_ANSI__) || defined(__KERNEL__) 47c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru# define __BYTEORDER_HAS_U64__ 48c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru# define __SWAB_64_THRU_32__ 49c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 50c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 51c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef __ARMEB__ 52c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/byteorder/big_endian.h> 53c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 54c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/byteorder/little_endian.h> 55c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 56c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 57c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 58c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 59