release/src-rt-6.x.4708/linux/linux-2.6.36/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
  22 static __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
  31 static __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
  36 static inline void __arch_swab16s(__u16 *addr)
  37 {
  38         st_le16(addr, *addr);
  39 }
  40 #define __arch_swab16s __arch_swab16s
  41
  42 static __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
  51 static __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
  56 static inline void __arch_swab32s(__u32 *addr)
  57 {
  58         st_le32(addr, *addr);
  59 }
  60 #define __arch_swab32s __arch_swab32s
  61
  62 static 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
  73 static 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 */