arch/arm/include/asm/byteorder.h

   1 /*
   2  *  linux/include/asm-arm/byteorder.h
   3  *
   4  * ARM Endian-ness.  In little endian mode, the data bus is connected such
   5  * that byte accesses appear as:
   6  *  0 = d0...d7, 1 = d8...d15, 2 = d16...d23, 3 = d24...d31
   7  * and word accesses (data or instruction) appear as:
   8  *  d0...d31
   9  *
  10  * When in big endian mode, byte accesses appear as:
  11  *  0 = d24...d31, 1 = d16...d23, 2 = d8...d15, 3 = d0...d7
  12  * and word accesses (data or instruction) appear as:
  13  *  d0...d31
  14  */
  15 #ifndef __ASM_ARM_BYTEORDER_H
  16 #define __ASM_ARM_BYTEORDER_H
  17
  18
  19 #include <asm/types.h>
  20
  21 #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
  22 #  define __BYTEORDER_HAS_U64__
  23 #  define __SWAB_64_THRU_32__
  24 #endif
  25
  26 #ifdef  CONFIG_ARM64
  27
  28 #ifdef __AARCH64EB__
  29 #include <linux/byteorder/big_endian.h>
  30 #else
  31 #include <linux/byteorder/little_endian.h>
  32 #endif
  33
  34 #else   /* CONFIG_ARM64 */
  35
  36 #ifdef __ARMEB__
  37 #include <linux/byteorder/big_endian.h>
  38 #else
  39 #include <linux/byteorder/little_endian.h>
  40 #endif
  41
  42 #endif  /* CONFIG_ARM64 */
  43
  44 #endif