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/compiler.h>
  12 #include <asm/types.h>
  13
  14 #ifdef __GNUC__
  15
  16 #ifdef CONFIG_CPU_MIPSR2
  17
  18 static __inline__ __attribute_const__ __u16 ___arch__swab16(__u16 x)
  19 {
  20         __asm__(
  21         "       wsbh    %0, %1                  \n"
  22         : "=r" (x)
  23         : "r" (x));
  24
  25         return x;
  26 }
  27 #define __arch__swab16(x)       ___arch__swab16(x)
  28
  29 static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
  30 {
  31         __asm__(
  32         "       wsbh    %0, %1                  \n"
  33         "       rotr    %0, %0, 16              \n"
  34         : "=r" (x)
  35         : "r" (x));
  36
  37         return x;
  38 }
  39 #define __arch__swab32(x)       ___arch__swab32(x)
  40
  41 #ifdef CONFIG_CPU_MIPS64_R2
  42
  43 static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x)
  44 {
  45         __asm__(
  46         "       dsbh    %0, %1                  \n"
  47         "       dshd    %0, %0                  \n"
  48         "       drotr   %0, %0, 32              \n"
  49         : "=r" (x)
  50         : "r" (x));
  51
  52         return x;
  53 }
  54
  55 #define __arch__swab64(x)       ___arch__swab64(x)
  56
  57 #endif /* CONFIG_CPU_MIPS64_R2 */
  58
  59 #endif /* CONFIG_CPU_MIPSR2 */
  60
  61 #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
  62 #  define __BYTEORDER_HAS_U64__
  63 #  define __SWAB_64_THRU_32__
  64 #endif
  65
  66 #endif /* __GNUC__ */
  67
  68 #if defined(__MIPSEB__)
  69 #  include <linux/byteorder/big_endian.h>
  70 #elif defined(__MIPSEL__)
  71 #  include <linux/byteorder/little_endian.h>
  72 #else
  73 #  error "MIPS, but neither __MIPSEB__, nor __MIPSEL__???"
  74 #endif
  75
  76 #endif /* _ASM_BYTEORDER_H */