diff options
Diffstat (limited to 'cpukit/include')
-rw-r--r-- | cpukit/include/rtems/endian.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/cpukit/include/rtems/endian.h b/cpukit/include/rtems/endian.h new file mode 100644 index 0000000000..678b8bad3b --- /dev/null +++ b/cpukit/include/rtems/endian.h @@ -0,0 +1,92 @@ +/* + * $Id$ + */ + +#ifndef _RTEMS_ENDIAN_H +#define _RTEMS_ENDIAN_H + +#include <rtems.h> + +/* + * BSD-style endian declaration + */ +#define BIG_ENDIAN 4321 +#define LITTLE_ENDIAN 1234 + +#ifndef BYTE_ORDER +#if CPU_BIG_ENDIAN +# define BYTE_ORDER BIG_ENDIAN +#elif CPU_LITTLE_ENDIAN +# define BYTE_ORDER LITTLE_ENDIAN +#else +# error "Can't decide which end is which!" +#endif +#endif + +#if ( CPU_BIG_ENDIAN == TRUE ) + +/* + * Very simply on big endian CPUs + */ + +static inline uint32_t ntohl( uint32_t _x ) +{ + return _x; +} + +static inline uint16_t ntohs( uint16_t _x ) +{ + return _x; +} + +static inline uint32_t htonl( uint32_t _x ) +{ + return _x; +} + +static inline uint16_t htons( uint16_t _x ) +{ + return _x; +} + +#define NTOHS(x) +#define HTONS(x) +#define NTOHL(x) +#define HTONL(x) + +#elif ( CPU_LITTLE_ENDIAN == TRUE ) + +/* + * A little more complicated on little endian CPUs + */ + +static inline uint32_t ntohl( uint32_t _x ) +{ + return CPU_swap_u32(_x); +} + +static inline uint16_t ntohs( uint16_t _x ) +{ + return CPU_swap_u16(_x); +} + +static inline uint32_t htonl( uint32_t _x ) +{ + return CPU_swap_u32(_x); +} + +static inline uint16_t htons( uint16_t _x ) +{ + return CPU_swap_u16(_x); +} + +#define NTOHS(x) (x) = ntohs(x) +#define HTONS(x) (x) = htons(x) +#define NTOHL(x) (x) = ntohl(x) +#define HTONL(x) (x) = htonl(x) + +#else +#error "Unknown endian-ness for this cpu" +#endif + +#endif /* _RTEMS_ENDIAN_H */ |