include/asm-powerpc/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 #ifdef __GNUC__
  15 #ifdef __KERNEL__
  16
  17 static __inline__ __u16 ld_le16(const volatile __u16 *addr)
  18 {
  19         __u16 val;
  20
  21         __asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
  22         return val;
  23 }
  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__ __u32 ld_le32(const volatile __u32 *addr)
  31 {
  32         __u32 val;
  33
  34         __asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
  35         return val;
  36 }
  37
  38 static __inline__ void st_le32(volatile __u32 *addr, const __u32 val)
  39 {
  40         __asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
  41 }
  42
  43 static __inline__ __attribute_const__ __u16 ___arch__swab16(__u16 value)
  44 {
  45         __u16 result;
  46
  47         __asm__("rlwimi %0,%1,8,16,23"
  48             : "=r" (result)
  49             : "r" (value), "0" (value >> 8));
  50         return result;
  51 }
  52
  53 static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 value)
  54 {
  55         __u32 result;
  56
  57         __asm__("rlwimi %0,%1,24,16,23\n\t"
  58             "rlwimi %0,%1,8,8,15\n\t"
  59             "rlwimi %0,%1,24,0,7"
  60             : "=r" (result)
  61             : "r" (value), "0" (value >> 24));
  62         return result;
  63 }
  64
  65 #define __arch__swab16(x) ___arch__swab16(x)
  66 #define __arch__swab32(x) ___arch__swab32(x)
  67
  68 /* The same, but returns converted value from the location pointer by addr. */
  69 #define __arch__swab16p(addr) ld_le16(addr)
  70 #define __arch__swab32p(addr) ld_le32(addr)
  71
  72 /* The same, but do the conversion in situ, ie. put the value back to addr. */
  73 #define __arch__swab16s(addr) st_le16(addr,*addr)
  74 #define __arch__swab32s(addr) st_le32(addr,*addr)
  75
  76 #endif /* __KERNEL__ */
  77
  78 #ifndef __STRICT_ANSI__
  79 #define __BYTEORDER_HAS_U64__
  80 #ifndef __powerpc64__
  81 #define __SWAB_64_THRU_32__
  82 #endif /* __powerpc64__ */
  83 #endif /* __STRICT_ANSI__ */
  84
  85 #endif /* __GNUC__ */
  86
  87 #include <linux/byteorder/big_endian.h>
  88
  89 #endif /* _ASM_POWERPC_BYTEORDER_H */