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

   1#ifndef _ASM_POWERPC_SWAB_H
   2#define _ASM_POWERPC_SWAB_H
   3
   4/*
   5 * This program is free software; you can redistribute it and/or
   6 * modify it under the terms of the GNU General Public License
   7 * as published by the Free Software Foundation; either version
   8 * 2 of the License, or (at your option) any later version.
   9 */
  10
  11#include <linux/types.h>
  12#include <linux/compiler.h>
  13
  14#ifdef __GNUC__
  15
  16#ifndef __powerpc64__
  17#define __SWAB_64_THRU_32__
  18#endif /* __powerpc64__ */
  19
  20#ifdef __KERNEL__
  21
  22static __inline__ __u16 ld_le16(const volatile __u16 *addr)
  23{
  24        __u16 val;
  25
  26        __asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
  27        return val;
  28}
  29#define __arch_swab16p ld_le16
  30
  31static __inline__ void st_le16(volatile __u16 *addr, const __u16 val)
  32{
  33        __asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
  34}
  35
  36static inline void __arch_swab16s(__u16 *addr)
  37{
  38        st_le16(addr, *addr);
  39}
  40#define __arch_swab16s __arch_swab16s
  41
  42static __inline__ __u32 ld_le32(const volatile __u32 *addr)
  43{
  44        __u32 val;
  45
  46        __asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
  47        return val;
  48}
  49#define __arch_swab32p ld_le32
  50
  51static __inline__ void st_le32(volatile __u32 *addr, const __u32 val)
  52{
  53        __asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
  54}
  55
  56static inline void __arch_swab32s(__u32 *addr)
  57{
  58        st_le32(addr, *addr);
  59}
  60#define __arch_swab32s __arch_swab32s
  61
  62static inline __attribute_const__ __u16 __arch_swab16(__u16 value)
  63{
  64        __u16 result;
  65
  66        __asm__("rlwimi %0,%1,8,16,23"
  67            : "=r" (result)
  68            : "r" (value), "0" (value >> 8));
  69        return result;
  70}
  71#define __arch_swab16 __arch_swab16
  72
  73static inline __attribute_const__ __u32 __arch_swab32(__u32 value)
  74{
  75        __u32 result;
  76
  77        __asm__("rlwimi %0,%1,24,16,23\n\t"
  78            "rlwimi %0,%1,8,8,15\n\t"
  79            "rlwimi %0,%1,24,0,7"
  80            : "=r" (result)
  81            : "r" (value), "0" (value >> 24));
  82        return result;
  83}
  84#define __arch_swab32 __arch_swab32
  85
  86#endif /* __KERNEL__ */
  87
  88#endif /* __GNUC__ */
  89
  90#endif /* _ASM_POWERPC_SWAB_H */
  91