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
  16 static __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
  25 static __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
  30 static inline void __arch_swab16s(__u16 *addr)
  31 {
  32         st_le16(addr, *addr);
  33 }
  34 #define __arch_swab16s __arch_swab16s
  35
  36 static __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
  45 static __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
  50 static inline void __arch_swab32s(__u32 *addr)
  51 {
  52         st_le32(addr, *addr);
  53 }
  54 #define __arch_swab32s __arch_swab32s
  55
  56 static 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
  67 static 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 */