arch/powerpc/include/asm/byteorder.h

   1 #ifndef _ASM_POWERPC_BYTEORDER_H
   2 #define _ASM_POWERPC_BYTEORDER_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 <asm/types.h>
  12 #include <linux/compiler.h>
  13
  14 #define __BIG_ENDIAN
  15
  16 #ifdef __GNUC__
  17 #ifdef __KERNEL__
  18
  19 static __inline__ __u16 ld_le16(const volatile __u16 *addr)
  20 {
  21         __u16 val;
  22
  23         __asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
  24         return val;
  25 }
  26 #define __arch_swab16p ld_le16
  27
  28 static __inline__ void st_le16(volatile __u16 *addr, const __u16 val)
  29 {
  30         __asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
  31 }
  32
  33 static inline void __arch_swab16s(__u16 *addr)
  34 {
  35         st_le16(addr, *addr);
  36 }
  37 #define __arch_swab16s __arch_swab16s
  38
  39 static __inline__ __u32 ld_le32(const volatile __u32 *addr)
  40 {
  41         __u32 val;
  42
  43         __asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
  44         return val;
  45 }
  46 #define __arch_swab32p ld_le32
  47
  48 static __inline__ void st_le32(volatile __u32 *addr, const __u32 val)
  49 {
  50         __asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
  51 }
  52
  53 static inline void __arch_swab32s(__u32 *addr)
  54 {
  55         st_le32(addr, *addr);
  56 }
  57 #define __arch_swab32s __arch_swab32s
  58
  59 static inline __attribute_const__ __u16 __arch_swab16(__u16 value)
  60 {
  61         __u16 result;
  62
  63         __asm__("rlwimi %0,%1,8,16,23"
  64             : "=r" (result)
  65             : "r" (value), "0" (value >> 8));
  66         return result;
  67 }
  68 #define __arch_swab16 __arch_swab16
  69
  70 static inline __attribute_const__ __u32 __arch_swab32(__u32 value)
  71 {
  72         __u32 result;
  73
  74         __asm__("rlwimi %0,%1,24,16,23\n\t"
  75             "rlwimi %0,%1,8,8,15\n\t"
  76             "rlwimi %0,%1,24,0,7"
  77             : "=r" (result)
  78             : "r" (value), "0" (value >> 24));
  79         return result;
  80 }
  81 #define __arch_swab32 __arch_swab32
  82
  83 #endif /* __KERNEL__ */
  84
  85 #ifndef __powerpc64__
  86 #define __SWAB_64_THRU_32__
  87 #endif /* __powerpc64__ */
  88
  89 #endif /* __GNUC__ */
  90
  91 #include <linux/byteorder.h>
  92
  93 #endif /* _ASM_POWERPC_BYTEORDER_H */