arch/s390/include/asm/swab.h

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