swab.h

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#ifndef _S390_SWAB_H
#define _S390_SWAB_H

/*
 *  S390 version
 *    Copyright IBM Corp. 1999
 *    Author(s): Martin Schwidefsky ([email protected])
 */

#include <linux/types.h>

#ifndef __s390x__
# define __SWAB_64_THRU_32__
#endif

#ifdef __s390x__
static inline __u64 __arch_swab64p(const __u64 *x)
{
    __u64 result;

    asm volatile("lrvg %0,%1" : "=d" (result) : "m" (*x));
    return result;
}
#define __arch_swab64p __arch_swab64p

static inline __u64 __arch_swab64(__u64 x)
{
    __u64 result;

    asm volatile("lrvgr %0,%1" : "=d" (result) : "d" (x));
    return result;
}
#define __arch_swab64 __arch_swab64

static inline void __arch_swab64s(__u64 *x)
{
    *x = __arch_swab64p(x);
}
#define __arch_swab64s __arch_swab64s
#endif /* __s390x__ */

static inline __u32 __arch_swab32p(const __u32 *x)
{
    __u32 result;
    
    asm volatile(
#ifndef __s390x__
        "   icm %0,8,%O1+3(%R1)\n"
        "   icm %0,4,%O1+2(%R1)\n"
        "   icm %0,2,%O1+1(%R1)\n"
        "   ic  %0,%1"
        : "=&d" (result) : "Q" (*x) : "cc");
#else /* __s390x__ */
        "   lrv %0,%1"
        : "=d" (result) : "m" (*x));
#endif /* __s390x__ */
    return result;
}
#define __arch_swab32p __arch_swab32p

#ifdef __s390x__
static inline __u32 __arch_swab32(__u32 x)
{
    __u32 result;
    
    asm volatile("lrvr  %0,%1" : "=d" (result) : "d" (x));
    return result;
}
#define __arch_swab32 __arch_swab32
#endif /* __s390x__ */

static inline __u16 __arch_swab16p(const __u16 *x)
{
    __u16 result;
    
    asm volatile(
#ifndef __s390x__
        "   icm %0,2,%O1+1(%R1)\n"
        "   ic  %0,%1\n"
        : "=&d" (result) : "Q" (*x) : "cc");
#else /* __s390x__ */
        "   lrvh    %0,%1"
        : "=d" (result) : "m" (*x));
#endif /* __s390x__ */
    return result;
}
#define __arch_swab16p __arch_swab16p

#endif /* _S390_SWAB_H */