byte_order.h

T－kernel Tcp/ip Protocol Stack Sample

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 * Copyright (C) 2001-2006 MITSUBISHI ELECTRIC CORPORATION and
 * RENESAS SOLUTIONS CORPORATION
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#ifndef _BYTE_ORDER_H_
#define _BYTE_ORDER_H_

/*
 * Definitions for byte order, according to byte significance from low
 * address to high.
 */
#define	LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
#define	BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
#define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */

#if defined(CPU_M32R) || defined(CPU_SH2)
#define	BYTE_ORDER	BIG_ENDIAN
#elif defined(CPU_SH3) || defined(CPU_SH4)
#define	BYTE_ORDER	LITTLE_ENDIAN
#endif

/*
 * Macros for network/external number representation conversion.
 */
#if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
#define	ntohl(x)	(x)
#define	ntohs(x)	(x)
#define	htonl(x)	(x)
#define	htons(x)	(x)

#define	NTOHL(x)	(void) (x)
#define	NTOHS(x)	(void) (x)
#define	HTONL(x)	(void) (x)
#define	HTONS(x)	(void) (x)

#else

#define	NTOHL(x)	(x) = ntohl((unsigned long)x)
#define	NTOHS(x)	(x) = ntohs((unsigned short)x)
#define	HTONL(x)	(x) = htonl((unsigned long)x)
#define	HTONS(x)	(x) = htons((unsigned short)x)

extern unsigned long htonl(unsigned long);
extern unsigned short htons(unsigned short);
extern unsigned long ntohl(unsigned long);
extern unsigned short ntohs(unsigned short);
#endif

#if defined(NOT_FASTMEMCPY)
#define	copyin(x,y,z)	memcpy(y,x,z)
#define	copyout(x,y,z)	memcpy(y,x,z)
#else
#define	copyin(x,y,z)	fast_memcpy(y,x,z)
#define	copyout(x,y,z)	fast_memcpy(y,x,z)
#endif

#define imax(a,b)  (((a) > (b)) ? (a):(b))
#define imin(a,b)  (((a) < (b)) ? (a):(b))
#define lmax(a,b)  (((a) > (b)) ? (a):(b))
#define lmin(a,b)  (((a) < (b)) ? (a):(b))
#define  max(a,b)  (((a) > (b)) ? (a):(b))
#define  min(a,b)  (((a) < (b)) ? (a):(b))

#endif /* !_BYTE_ORDER_H_ */