/******************************************************************************
*
* (c) Copyright 2009 Xilinx, Inc. All rights reserved.
*
* This file contains confidential and proprietary information of Xilinx, Inc.
* and is protected under U.S. and international copyright and other
* intellectual property laws.
*
* DISCLAIMER
* This disclaimer is not a license and does not grant any rights to the
* materials distributed herewith. Except as otherwise provided in a valid
* license issued to you by Xilinx, and to the maximum extent permitted by
* applicable law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND WITH ALL
* FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS,
* IMPLIED, OR STATUTORY, INCLUDING BUT NOT LIMITED TO WARRANTIES OF
* MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE;
* and (2) Xilinx shall not be liable (whether in contract or tort, including
* negligence, or under any other theory of liability) for any loss or damage
* of any kind or nature related to, arising under or in connection with these
* materials, including for any direct, or any indirect, special, incidental,
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* CRITICAL APPLICATIONS
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*
* THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS PART OF THIS FILE
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*
******************************************************************************/
/*****************************************************************************/
/**
*
* @file xil_io.c
*
* Contains I/O functions for memory-mapped architectures.  These functions
* encapsulate generic CPU I/O requirements.
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver   Who  Date	 Changes
* ----- ---- -------- -------------------------------------------------------
* 3.00a hbm  07/28/09 Initial release
* 3.00a hbm  07/21/10 Added Xil_EndianSwap32/16, Xil_Htonl/s, Xil_Ntohl/s
*
* </pre>
*
* @note
*
* This file may contain architecture-dependent code.
*
******************************************************************************/

/***************************** Include Files *********************************/

#include "xil_io.h"
#include "xil_types.h"

/************************** Constant Definitions *****************************/


/**************************** Type Definitions *******************************/


/***************** Macros (Inline Functions) Definitions *********************/


/************************** Function Prototypes ******************************/



/*****************************************************************************/
/**
*
* Perform a 16-bit endian converion.
*
* @param	Data contains the value to be converted.
*
* @return	converted value.
*
* @note		None.
*
******************************************************************************/
u16 Xil_EndianSwap16(u16 Data)
{
	return (u16) (((Data & 0xFF00) >> 8) | ((Data & 0x00FF) << 8));
}

/*****************************************************************************/
/**
*
* Perform a 32-bit endian converion.
*
* @param	Data contains the value to be converted.
*
* @return	converted value.
*
* @note		None.
*
******************************************************************************/
u32 Xil_EndianSwap32(u32 Data)
{
	u16 LoWord;
	u16 HiWord;

	/* get each of the half words from the 32 bit word */

	LoWord = (u16) (Data & 0x0000FFFF);
	HiWord = (u16) ((Data & 0xFFFF0000) >> 16);

	/* byte swap each of the 16 bit half words */

	LoWord = (((LoWord & 0xFF00) >> 8) | ((LoWord & 0x00FF) << 8));
	HiWord = (((HiWord & 0xFF00) >> 8) | ((HiWord & 0x00FF) << 8));

	/* swap the half words before returning the value */

	return (u32) ((LoWord << 16) | HiWord);
}

/*****************************************************************************/
/**
*
* Perform a little-endian input operation for a 16-bit memory location
* by reading from the specified address and returning the byte-swapped value
* read from that address.
*
* @param	Addr contains the address to perform the input operation at.
*
* @return	The value read from the specified input address with the
*		proper endianness. The return value has the same endianness
*		as that of the processor, i.e. if the processor is big-engian,
*		the return value is the byte-swapped value read from the
*		address.
*
*
* @note		None.
*
******************************************************************************/
#ifndef __LITTLE_ENDIAN__
u16 Xil_In16LE(u32 Addr)
#else
u16 Xil_In16BE(u32 Addr)
#endif
{
	u16 Value;

	/* get the data then swap it */
	Value = Xil_In16(Addr);

	return Xil_EndianSwap16(Value);
}

/*****************************************************************************/
/**
*
* Perform a little-endian input operation for a 32-bit memory location
* by reading from the specified address and returning the byte-swapped value
* read from that address.
*
* @param	Addr contains the address to perform the input operation at.
*
* @return	The value read from the specified input address with the
*		proper endianness. The return value has the same endianness
*		as that of the processor, i.e. if the processor is big-engian,
*		the return value is the byte-swapped value read from the
*		address.
*
* @note		None.
*
******************************************************************************/
#ifndef __LITTLE_ENDIAN__
u32 Xil_In32LE(u32 Addr)
#else
u32 Xil_In32BE(u32 Addr)
#endif
{
	u32 InValue;

	/* get the data then swap it */
	InValue = Xil_In32(Addr);
	return Xil_EndianSwap32(InValue);
}

/*****************************************************************************/
/**
*
* Perform a little-endian output operation for a 16-bit memory location by
* writing the specified value to the the specified address. The value is
* byte-swapped before being written.
*
* @param	Addr contains the address to perform the output operation at.
* @param	Value contains the value to be output at the specified address.
*		The value has the same endianness as that of the processor.
*		If the processor is big-endian, the byte-swapped value is
*		written to the address.
*
* @return	None.
*
* @note		None.
*
******************************************************************************/
#ifndef __LITTLE_ENDIAN__
void Xil_Out16LE(u32 Addr, u16 Value)
#else
void Xil_Out16BE(u32 Addr, u16 Value)
#endif
{
	u16 OutValue;

	/* swap the data then output it */
	OutValue = Xil_EndianSwap16(Value);

	Xil_Out16(Addr, OutValue);
}

/*****************************************************************************/
/**
*
* Perform a little-endian output operation for a 32-bit memory location
* by writing the specified value to the the specified address. The value is
* byte-swapped before being written.
*
* @param	Addr contains the address at which the output operation at.
* @param	Value contains the value to be output at the specified address.
*		The value has the same endianness as that of the processor.
*		If the processor is big-endian, the byte-swapped value is
*		written to the address.
*
* @return	None.
*
* @note		None.
*
******************************************************************************/
#ifndef __LITTLE_ENDIAN__
void Xil_Out32LE(u32 Addr, u32 Value)
#else
void Xil_Out32BE(u32 Addr, u32 Value)
#endif
{
	u32 OutValue;

	/* swap the data then output it */
	OutValue = Xil_EndianSwap32(Value);
	Xil_Out32(Addr, OutValue);
}
