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 #if (defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) || \ 17 defined(_MIPS_ARCH_LOONGSON3A) 18 __arch_swab16(__u16 x)19static inline __attribute_const__ __u16 __arch_swab16(__u16 x) 20 { 21 __asm__( 22 " .set push \n" 23 " .set arch=mips32r2 \n" 24 " wsbh %0, %1 \n" 25 " .set pop \n" 26 : "=r" (x) 27 : "r" (x)); 28 29 return x; 30 } 31 #define __arch_swab16 __arch_swab16 32 __arch_swab32(__u32 x)33static inline __attribute_const__ __u32 __arch_swab32(__u32 x) 34 { 35 __asm__( 36 " .set push \n" 37 " .set arch=mips32r2 \n" 38 " wsbh %0, %1 \n" 39 " rotr %0, %0, 16 \n" 40 " .set pop \n" 41 : "=r" (x) 42 : "r" (x)); 43 44 return x; 45 } 46 #define __arch_swab32 __arch_swab32 47 48 /* 49 * Having already checked for MIPS R2, enable the optimized version for 50 * 64-bit kernel on r2 CPUs. 51 */ 52 #ifdef __mips64 __arch_swab64(__u64 x)53static inline __attribute_const__ __u64 __arch_swab64(__u64 x) 54 { 55 __asm__( 56 " .set push \n" 57 " .set arch=mips64r2 \n" 58 " dsbh %0, %1 \n" 59 " dshd %0, %0 \n" 60 " .set pop \n" 61 : "=r" (x) 62 : "r" (x)); 63 64 return x; 65 } 66 #define __arch_swab64 __arch_swab64 67 #endif /* __mips64 */ 68 #endif /* MIPS R2 or newer or Loongson 3A */ 69 #endif /* _ASM_SWAB_H */ 70