1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1996, 99, 2003 by Ralf Baechle 7 */ 8#ifndef _ASM_SWAB_H 9#define _ASM_SWAB_H 10 11#include <linux/compiler.h> 12#include <linux/types.h> 13 14#define __SWAB_64_THRU_32__ 15 16#ifdef CONFIG_CPU_MIPSR2 17 18static inline __attribute_const__ __u16 __arch_swab16(__u16 x) 19{ 20 __asm__( 21 " wsbh %0, %1 \n" 22 : "=r" (x) 23 : "r" (x)); 24 25 return x; 26} 27#define __arch_swab16 __arch_swab16 28 29static inline __attribute_const__ __u32 __arch_swab32(__u32 x) 30{ 31 __asm__( 32 " wsbh %0, %1 \n" 33 " rotr %0, %0, 16 \n" 34 : "=r" (x) 35 : "r" (x)); 36 37 return x; 38} 39#define __arch_swab32 __arch_swab32 40 41/* 42 * Having already checked for CONFIG_CPU_MIPSR2, enable the 43 * optimized version for 64-bit kernel on r2 CPUs. 44 */ 45#ifdef CONFIG_64BIT 46static inline __attribute_const__ __u64 __arch_swab64(__u64 x) 47{ 48 __asm__( 49 " dsbh %0, %1\n" 50 " dshd %0, %0" 51 : "=r" (x) 52 : "r" (x)); 53 54 return x; 55} 56#define __arch_swab64 __arch_swab64 57#endif /* CONFIG_64BIT */ 58#endif /* CONFIG_CPU_MIPSR2 */ 59#endif /* _ASM_SWAB_H */ 60