LXR linux/arch/s390/include/asm/swab.h

   1#ifndef _S390_SWAB_H
   2#define _S390_SWAB_H
   3
   4/*
   5 *  include/asm-s390/swab.h
   6 *
   7 *  S390 version
   8 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   9 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
  10 */
  11
  12#include <linux/types.h>
  13
  14#ifndef __s390x__
  15# define __SWAB_64_THRU_32__
  16#endif
  17
  18#ifdef __s390x__
  19static inline __u64 __arch_swab64p(const __u64 *x)
  20{
  21        __u64 result;
  22
  23        asm volatile("lrvg %0,%1" : "=d" (result) : "m" (*x));
  24        return result;
  25}
  26#define __arch_swab64p __arch_swab64p
  27
  28static inline __u64 __arch_swab64(__u64 x)
  29{
  30        __u64 result;
  31
  32        asm volatile("lrvgr %0,%1" : "=d" (result) : "d" (x));
  33        return result;
  34}
  35#define __arch_swab64 __arch_swab64
  36
  37static inline void __arch_swab64s(__u64 *x)
  38{
  39        *x = __arch_swab64p(x);
  40}
  41#define __arch_swab64s __arch_swab64s
  42#endif /* __s390x__ */
  43
  44static inline __u32 __arch_swab32p(const __u32 *x)
  45{
  46        __u32 result;
  47        
  48        asm volatile(
  49#ifndef __s390x__
  50                "       icm     %0,8,%O1+3(%R1)\n"
  51                "       icm     %0,4,%O1+2(%R1)\n"
  52                "       icm     %0,2,%O1+1(%R1)\n"
  53                "       ic      %0,%1"
  54                : "=&d" (result) : "Q" (*x) : "cc");
  55#else /* __s390x__ */
  56                "       lrv     %0,%1"
  57                : "=d" (result) : "m" (*x));
  58#endif /* __s390x__ */
  59        return result;
  60}
  61#define __arch_swab32p __arch_swab32p
  62
  63#ifdef __s390x__
  64static inline __u32 __arch_swab32(__u32 x)
  65{
  66        __u32 result;
  67        
  68        asm volatile("lrvr  %0,%1" : "=d" (result) : "d" (x));
  69        return result;
  70}
  71#define __arch_swab32 __arch_swab32
  72#endif /* __s390x__ */
  73
  74static inline __u16 __arch_swab16p(const __u16 *x)
  75{
  76        __u16 result;
  77        
  78        asm volatile(
  79#ifndef __s390x__
  80                "       icm     %0,2,%O+1(%R1)\n"
  81                "       ic      %0,%1\n"
  82                : "=&d" (result) : "Q" (*x) : "cc");
  83#else /* __s390x__ */
  84                "       lrvh    %0,%1"
  85                : "=d" (result) : "m" (*x));
  86#endif /* __s390x__ */
  87        return result;
  88}
  89#define __arch_swab16p __arch_swab16p
  90
  91#endif /* _S390_SWAB_H */
  92