blob: a45470a8b74abb89d6c19b10985c2ef4bc8cd450 (
plain) (
tree)
|
|
#ifndef _I386_BYTEORDER_H
#define _I386_BYTEORDER_H
#include <asm/types.h>
#include <linux/compiler.h>
#ifdef __GNUC__
/* For avoiding bswap on i386 */
#ifdef __KERNEL__
#endif
static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
{
#ifdef CONFIG_X86_BSWAP
__asm__("bswap %0" : "=r" (x) : "0" (x));
#else
__asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */
"rorl $16,%0\n\t" /* swap words */
"xchgb %b0,%h0" /* swap higher bytes */
:"=q" (x)
: "0" (x));
#endif
return x;
}
static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val)
{
union {
struct { __u32 a,b; } s;
__u64 u;
} v;
v.u = val;
#ifdef CONFIG_X86_BSWAP
asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
: "=r" (v.s.a), "=r" (v.s.b)
: "0" (v.s.a), "1" (v.s.b));
#else
v.s.a = ___arch__swab32(v.s.a);
v.s.b = ___arch__swab32(v.s.b);
asm("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b));
#endif
return v.u;
}
/* Do not define swab16. Gcc is smart enough to recognize "C" version and
convert it into rotation or exhange. */
#define __arch__swab64(x) ___arch__swab64(x)
#define __arch__swab32(x) ___arch__swab32(x)
#define __BYTEORDER_HAS_U64__
#endif /* __GNUC__ */
#include <linux/byteorder/little_endian.h>
#endif /* _I386_BYTEORDER_H */
|
