[deliverable/linux.git] / include / asm-x86 / byteorder.h

#ifndef _ASM_X86_BYTEORDER_H
#define _ASM_X86_BYTEORDER_H

#include <asm/types.h>
#include <linux/compiler.h>

#ifdef __GNUC__

#ifdef __i386__

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;
}

#else /* __i386__ */

static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x)
{
	__asm__("bswapq %0" : "=r" (x) : "0" (x));
	return x;
}

static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
{
	__asm__("bswapl %0" : "=r" (x) : "0" (x));
	return x;
}

#endif

/* 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 /* _ASM_X86_BYTEORDER_H */
Commit	Line	Data
acbbbe9f TG	1	#ifndef _ASM_X86_BYTEORDER_H
	2	#define _ASM_X86_BYTEORDER_H
	3
	4	#include <asm/types.h>
	5	#include <linux/compiler.h>
	6
	7	#ifdef __GNUC__
	8
	9	#ifdef __i386__
	10
	11	static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
	12	{
	13	#ifdef CONFIG_X86_BSWAP
	14	__asm__("bswap %0" : "=r" (x) : "0" (x));
96a388de	15	#else
acbbbe9f TG	16	__asm__("xchgb %b0,%h0\n\t" /* swap lower bytes */
	17	"rorl $16,%0\n\t" /* swap words */
	18	"xchgb %b0,%h0" /* swap higher bytes */
	19	:"=q" (x)
	20	: "0" (x));
96a388de	21	#endif
acbbbe9f TG	22	return x;
	23	}
	24
	25	static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val)
	26	{
	27	union {
	28	struct { __u32 a,b; } s;
	29	__u64 u;
	30	} v;
	31	v.u = val;
	32	#ifdef CONFIG_X86_BSWAP
e0c4ae06	33	__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
acbbbe9f TG	34	: "=r" (v.s.a), "=r" (v.s.b)
	35	: "0" (v.s.a), "1" (v.s.b));
	36	#else
	37	v.s.a = ___arch__swab32(v.s.a);
	38	v.s.b = ___arch__swab32(v.s.b);
e0c4ae06	39	__asm__("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b));
acbbbe9f TG	40	#endif
	41	return v.u;
	42	}
	43
	44	#else /* __i386__ */
	45
	46	static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x)
	47	{
	48	__asm__("bswapq %0" : "=r" (x) : "0" (x));
	49	return x;
	50	}
	51
	52	static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
	53	{
	54	__asm__("bswapl %0" : "=r" (x) : "0" (x));
	55	return x;
	56	}
	57
	58	#endif
	59
	60	/* Do not define swab16. Gcc is smart enough to recognize "C" version and
	61	convert it into rotation or exhange. */
	62
	63	#define __arch__swab64(x) ___arch__swab64(x)
	64	#define __arch__swab32(x) ___arch__swab32(x)
	65
	66	#define __BYTEORDER_HAS_U64__
	67
	68	#endif /* __GNUC__ */
	69
	70	#include <linux/byteorder/little_endian.h>
	71
	72	#endif /* _ASM_X86_BYTEORDER_H */