include/asm-mips/byteorder.h

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1996, 99, 2003 by Ralf Baechle
   7  */
   8 #ifndef _ASM_BYTEORDER_H
   9 #define _ASM_BYTEORDER_H
  10
  11 #include <linux/config.h>
  12 #include <linux/compiler.h>
  13 #include <asm/types.h>
  14
  15 #ifdef __GNUC__
  16
  17 #ifdef CONFIG_CPU_MIPSR2
  18
  19 static __inline__ __attribute_const__ __u16 ___arch__swab16(__u16 x)
  20 {
  21         __asm__(
  22         "       wsbh    %0, %1                  \n"
  23         : "=r" (x)
  24         : "r" (x));
  25
  26         return x;
  27 }
  28 #define __arch__swab16(x)       ___arch__swab16(x)
  29
  30 static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
  31 {
  32         __asm__(
  33         "       wsbh    %0, %1                  \n"
  34         "       rotr    %0, %0, 16              \n"
  35         : "=r" (x)
  36         : "r" (x));
  37
  38         return x;
  39 }
  40 #define __arch__swab32(x)       ___arch__swab32(x)
  41
  42 #ifdef CONFIG_CPU_MIPS64_R2
  43
  44 static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x)
  45 {
  46         __asm__(
  47         "       dsbh    %0, %1                  \n"
  48         "       dshd    %0, %0                  \n"
  49         "       drotr   %0, %0, 32              \n"
  50         : "=r" (x)
  51         : "r" (x));
  52
  53         return x;
  54 }
  55
  56 #define __arch__swab64(x)       ___arch__swab64(x)
  57
  58 #endif /* CONFIG_CPU_MIPS64_R2 */
  59
  60 #endif /* CONFIG_CPU_MIPSR2 */
  61
  62 #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
  63 #  define __BYTEORDER_HAS_U64__
  64 #  define __SWAB_64_THRU_32__
  65 #endif
  66
  67 #endif /* __GNUC__ */
  68
  69 #if defined (__MIPSEB__)
  70 #  include <linux/byteorder/big_endian.h>
  71 #elif defined (__MIPSEL__)
  72 #  include <linux/byteorder/little_endian.h>
  73 #else
  74 #  error "MIPS, but neither __MIPSEB__, nor __MIPSEL__???"
  75 #endif
  76
  77 #endif /* _ASM_BYTEORDER_H */