ia64/xen-unstable

view old/xenolinux-2.4.16-sparse/include/asm-xeno/byteorder.h @ 235:d7d0a23b2e07

bitkeeper revision 1.93 (3e5a4e6bkPheUp3x1uufN2MS3LAB7A)

Latest and Greatest version of XenoLinux based on the Linux-2.4.21-pre4
kernel.
author iap10@labyrinth.cl.cam.ac.uk
date Mon Feb 24 16:55:07 2003 +0000 (2003-02-24)
parents
children
line source
1 #ifndef _I386_BYTEORDER_H
2 #define _I386_BYTEORDER_H
4 #include <asm/types.h>
6 #ifdef __GNUC__
8 /* For avoiding bswap on i386 */
9 #ifdef __KERNEL__
10 #include <linux/config.h>
11 #endif
13 static __inline__ __const__ __u32 ___arch__swab32(__u32 x)
14 {
15 #ifdef CONFIG_X86_BSWAP
16 __asm__("bswap %0" : "=r" (x) : "0" (x));
17 #else
18 __asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */
19 "rorl $16,%0\n\t" /* swap words */
20 "xchgb %b0,%h0" /* swap higher bytes */
21 :"=q" (x)
22 : "0" (x));
23 #endif
24 return x;
25 }
27 static __inline__ __const__ __u16 ___arch__swab16(__u16 x)
28 {
29 __asm__("xchgb %b0,%h0" /* swap bytes */ \
30 : "=q" (x) \
31 : "0" (x)); \
32 return x;
33 }
35 #define __arch__swab32(x) ___arch__swab32(x)
36 #define __arch__swab16(x) ___arch__swab16(x)
38 #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
39 # define __BYTEORDER_HAS_U64__
40 # define __SWAB_64_THRU_32__
41 #endif
43 #endif /* __GNUC__ */
45 #include <linux/byteorder/little_endian.h>
47 #endif /* _I386_BYTEORDER_H */