1 /**************************************************************************** 2 **************************************************************************** 3 *** 4 *** This header was automatically generated from a Linux kernel header 5 *** of the same name, to make information necessary for userspace to 6 *** call into the kernel available to libc. It contains only constants, 7 *** structures, and macros generated from the original header, and thus, 8 *** contains no copyrightable information. 9 *** 10 **************************************************************************** 11 ****************************************************************************/ 12 #ifndef _ASM_X86_BYTEORDER_H 13 #define _ASM_X86_BYTEORDER_H 14 15 #include <asm/types.h> 16 #include <linux/compiler.h> 17 18 #ifdef __GNUC__ 19 20 #ifdef __i386__ 21 22 static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x) 23 { 24 __asm__("xchgb %b0,%h0\n\t" 25 "rorl $16,%0\n\t" 26 "xchgb %b0,%h0" 27 :"=q" (x) 28 : "0" (x)); 29 return x; 30 } 31 32 static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val) 33 { 34 union { 35 struct { __u32 a,b; } s; 36 __u64 u; 37 } v; 38 v.u = val; 39 v.s.a = ___arch__swab32(v.s.a); 40 v.s.b = ___arch__swab32(v.s.b); 41 __asm__("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b)); 42 return v.u; 43 } 44 45 #else 46 47 static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x) 48 { 49 __asm__("bswapq %0" : "=r" (x) : "0" (x)); 50 return x; 51 } 52 53 static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x) 54 { 55 __asm__("bswapl %0" : "=r" (x) : "0" (x)); 56 return x; 57 } 58 59 #endif 60 61 #define __arch__swab64(x) ___arch__swab64(x) 62 #define __arch__swab32(x) ___arch__swab32(x) 63 64 #define __BYTEORDER_HAS_U64__ 65 66 #endif 67 68 #include <linux/byteorder/little_endian.h> 69 70 #endif 71
