Byte Order

Byte-order management for the SH4 architecture More...

Files
file	byteorder.h
	Byte-order related macros.

Macros
#define	BYTE_ORDER   LITTLE_ENDIAN
	Define the byte-order of the platform in use.
#define	arch_swap16(x)
	Swap the byte order of a 16-bit integer.
#define	arch_swap32(x)
	Swap the byte order of a 32-bit integer.
#define	arch_ntohs(x)   arch_swap16(x)
	Convert network-to-host short.
#define	arch_ntohl(x)   arch_swap32(x)
	Convert network-to-host long.
#define	arch_htons(x)   arch_swap16(x)
	Convert host-to-network short.
#define	arch_htonl(x)   arch_swap32(x)
	Convert host-to-network long.

Detailed Description

Byte-order management for the SH4 architecture

Macro Definition Documentation

arch_htonl

#define arch_htonl

(

x

)

arch_swap32(x)

Convert host-to-network long.

This macro converts a value in the host's native byte order to network byte order (big endian). On a little endian system (like the Dreamcast), this should just call arch_swap32(). On a big endian system, this should be a no-op.

Parameters

x	The value to be converted. This should be a uint32, or equivalent.

Returns

The converted value.

arch_htons

#define arch_htons

(

x

)

arch_swap16(x)

Convert host-to-network short.

This macro converts a value in the host's native byte order to network byte order (big endian). On a little endian system (like the Dreamcast), this should just call arch_swap16(). On a big endian system, this should be a no-op.

Parameters

x	The value to be converted. This should be a uint16, or equivalent.

Returns

The converted value.

arch_ntohl

#define arch_ntohl

(

x

)

arch_swap32(x)

Convert network-to-host long.

This macro converts a network byte order (big endian) value to the host's native byte order. On a little endian system (like the Dreamcast), this should just call arch_swap32(). On a big endian system, this should be a no-op.

Parameters

x	The value to be converted. This should be a uint32, or equivalent.

Returns

The converted value.

arch_ntohs

#define arch_ntohs

(

x

)

arch_swap16(x)

Convert network-to-host short.

This macro converts a network byte order (big endian) value to the host's native byte order. On a little endian system (like the Dreamcast), this should just call arch_swap16(). On a big endian system, this should be a no-op.

Parameters

x	The value to be converted. This should be a uint16, or equivalent.

Returns

The converted value.

arch_swap16

#define arch_swap16

(

x

)

Value:

    ({ \
    uint16 __x = (x); \
    __asm__ __volatile__("swap.b %0, %0" : "=r" (__x) : "0" (__x)); \
    __x; \
})

Swap the byte order of a 16-bit integer.

This macro swaps the byte order of a 16-bit integer in an architecture- defined manner.

Parameters

x	The value to be byte-swapped. This should be a uint16, or equivalent.

Returns

The swapped value.

arch_swap32

#define arch_swap32

(

x

)

Value:

    ({ \
    uint32 __x = (x); \
    __asm__ __volatile__("swap.b %0, %0\n\t" \
                         "swap.w %0, %0\n\t" \
                         "swap.b %0, %0\n\t" : "=r"(__x) : "0" (__x)); \
    __x; \
})

Swap the byte order of a 32-bit integer.

This macro swaps the byte order of a 32-bit integer in an architecture- defined manner.

Parameters

x	The value to be byte-swapped. This should be a uint32, or equivalent.

Returns

The swapped value.

BYTE_ORDER

#define BYTE_ORDER   LITTLE_ENDIAN

Define the byte-order of the platform in use.