/*
 * local version of endian.h - byte order defines
 *
 * Copyright 2005, Broadcom Corporation   
 * All Rights Reserved.   
 *    
 * THIS SOFTWARE IS OFFERED "AS IS", AND BROADCOM GRANTS NO WARRANTIES OF ANY   
 * KIND, EXPRESS OR IMPLIED, BY STATUTE, COMMUNICATION OR OTHERWISE. BROADCOM   
 * SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS   
 * FOR A SPECIFIC PURPOSE OR NONINFRINGEMENT CONCERNING THIS SOFTWARE.   
 *
 *  $Id: bcmendian.h,v 1.1.1.8 2005/03/07 07:31:12 kanki Exp $
*/

#ifndef _BCMENDIAN_H_
#define _BCMENDIAN_H_

#include <typedefs.h>

/* Byte swap a 16 bit value */
#define BCMSWAP16(val) \
	((uint16)( \
		(((uint16)(val) & (uint16)0x00ffU) << 8) | \
		(((uint16)(val) & (uint16)0xff00U) >> 8) ))
	
/* Byte swap a 32 bit value */
#define BCMSWAP32(val) \
	((uint32)( \
		(((uint32)(val) & (uint32)0x000000ffUL) << 24) | \
		(((uint32)(val) & (uint32)0x0000ff00UL) <<  8) | \
		(((uint32)(val) & (uint32)0x00ff0000UL) >>  8) | \
		(((uint32)(val) & (uint32)0xff000000UL) >> 24) ))

static INLINE uint16
bcmswap16(uint16 val)
{
	return BCMSWAP16(val);
}

static INLINE uint32
bcmswap32(uint32 val)
{
	return BCMSWAP32(val);
}

/* buf	- start of buffer of shorts to swap */
/* len  - byte length of buffer */
static INLINE void
bcmswap16_buf(uint16 *buf, uint len)
{
	len = len/2;

	while(len--){
		*buf = bcmswap16(*buf);
		buf++;
	}
}

#ifndef hton16
#ifndef IL_BIGENDIAN
#define HTON16(i) BCMSWAP16(i)
#define	hton16(i) bcmswap16(i)
#define	hton32(i) bcmswap32(i)
#define	ntoh16(i) bcmswap16(i)
#define	ntoh32(i) bcmswap32(i)
#define ltoh16(i) (i)
#define ltoh32(i) (i)
#define htol16(i) (i)
#define htol32(i) (i)
#else
#define HTON16(i) (i)
#define	hton16(i) (i)
#define	hton32(i) (i)
#define	ntoh16(i) (i)
#define	ntoh32(i) (i)
#define	ltoh16(i) bcmswap16(i)
#define	ltoh32(i) bcmswap32(i)
#define htol16(i) bcmswap16(i)
#define htol32(i) bcmswap32(i)
#endif
#endif

#ifndef IL_BIGENDIAN
#define ltoh16_buf(buf, i)
#define htol16_buf(buf, i)
#else
#define ltoh16_buf(buf, i) bcmswap16_buf((uint16*)buf, i)
#define htol16_buf(buf, i) bcmswap16_buf((uint16*)buf, i)
#endif

/*
* load 16-bit value from unaligned little endian byte array.
*/
static INLINE uint16
ltoh16_ua(uint8 *bytes)
{
	return (bytes[1]<<8)+bytes[0];
}

/*
* load 32-bit value from unaligned little endian byte array.
*/
static INLINE uint32
ltoh32_ua(uint8 *bytes)
{
	return (bytes[3]<<24)+(bytes[2]<<16)+(bytes[1]<<8)+bytes[0];
}

/*
* load 16-bit value from unaligned big(network) endian byte array.
*/
static INLINE uint16
ntoh16_ua(uint8 *bytes)
{
	return (bytes[0]<<8)+bytes[1];
}

/*
* load 32-bit value from unaligned big(network) endian byte array.
*/
static INLINE uint32
ntoh32_ua(uint8 *bytes)
{
	return (bytes[0]<<24)+(bytes[1]<<16)+(bytes[2]<<8)+bytes[3];
}

/* get_ua adapted from Linux asm-mips/unaligned.h */
#ifdef IL_BIGENDIAN
#define get_ua(ptr)						\
({									\
	__typeof__(*(ptr)) __val;					\
									\
	switch (sizeof(*(ptr))) {					\
	case 1:								\
		__val = *(uint8 *)ptr;			\
		break;							\
	case 2:								\
		__val = ntoh16_ua((uint8 *)ptr);		\
		break;							\
	case 4:								\
		__val = ntoh32_ua((uint8 *)ptr);		\
		break;							\
	}								\
									\
	__val;								\
})
#else
#define get_ua(ptr)						\
({									\
	__typeof__(*(ptr)) __val;					\
									\
	switch (sizeof(*(ptr))) {					\
	case 1:								\
		__val = *(uint8 *)ptr;			\
		break;							\
	case 2:								\
		__val = ltoh16_ua((uint8 *)ptr);		\
		break;							\
	case 4:								\
		__val = ltoh32_ua((uint8 *)ptr);		\
		break;							\
	}								\
									\
	__val;								\
})
#endif

#endif /* _BCMENDIAN_H_ */