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

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