1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 #ifndef _ASM_X86_SWAB_H 3 #define _ASM_X86_SWAB_H 4 5 #include <linux/types.h> 6 #include <linux/compiler.h> 7 8 static inline __attribute_const__ __u32 __arch_swab32(__u32 val) 9 { 10 asm("bswapl %0" : "=r" (val) : "0" (val)); 11 return val; 12 } 13 #define __arch_swab32 __arch_swab32 14 15 static inline __attribute_const__ __u64 __arch_swab64(__u64 val) 16 { 17 #ifdef __i386__ 18 union { 19 struct { 20 __u32 a; 21 __u32 b; 22 } s; 23 __u64 u; 24 } v; 25 v.u = val; 26 asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1" 27 : "=r" (v.s.a), "=r" (v.s.b) 28 : "0" (v.s.a), "1" (v.s.b)); 29 return v.u; 30 #else /* __i386__ */ 31 asm("bswapq %0" : "=r" (val) : "0" (val)); 32 return val; 33 #endif 34 } 35 #define __arch_swab64 __arch_swab64 36 37 #endif /* _ASM_X86_SWAB_H */ 38
