/* $Id: xio.c,v 1.4 2003/11/07 21:40:42 moleres Exp $ *//********************************************************************************       XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS"*       AS A COURTESY TO YOU, SOLELY FOR USE IN DEVELOPING PROGRAMS AND*       SOLUTIONS FOR XILINX DEVICES.  BY PROVIDING THIS DESIGN, CODE,*       OR INFORMATION AS ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE,*       APPLICATION OR STANDARD, XILINX IS MAKING NO REPRESENTATION*       THAT THIS IMPLEMENTATION IS FREE FROM ANY CLAIMS OF INFRINGEMENT,*       AND YOU ARE RESPONSIBLE FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE*       FOR YOUR IMPLEMENTATION.  XILINX EXPRESSLY DISCLAIMS ANY*       WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE*       IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR*       REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF*       INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS*       FOR A PARTICULAR PURPOSE.**       (c) Copyright 2002-2003 Xilinx Inc.*       All rights reserved.*******************************************************************************//*****************************************************************************//**** @file xio.c** Contains I/O functions for memory-mapped or non-memory-mapped I/O* architectures.  These functions encapsulate generic CPU I/O requirements.** <pre>* MODIFICATION HISTORY:** Ver   Who  Date     Changes* ----- ---- -------- -------------------------------------------------------* 1.00a rpm  11/07/03 Added InSwap/OutSwap routines for endian conversion* </pre>** @note** This file may contain architecture-dependent code.*******************************************************************************//***************************** Include Files *********************************/#include "xio.h"#include "xbasic_types.h"/************************** Constant Definitions *****************************//**************************** Type Definitions *******************************//***************** Macros (Inline Functions) Definitions *********************//************************** Function Prototypes ******************************//*****************************************************************************//**** Performs a 16-bit endian converion.** @param    Source contains the value to be converted.* @param    DestPtr contains a pointer to the location to put the*           converted value.** @return** None.** @note** None.*******************************************************************************/void XIo_EndianSwap16(Xuint16 Source, Xuint16* DestPtr){    *DestPtr = (Xuint16)(((Source & 0xFF00) >> 8) | ((Source & 0x00FF) << 8));}/*****************************************************************************//**** Performs a 32-bit endian converion.** @param    Source contains the value to be converted.* @param    DestPtr contains a pointer to the location to put the*           converted value.** @return** None.** @note** None.*******************************************************************************/void XIo_EndianSwap32(Xuint32 Source, Xuint32* DestPtr){    /* get each of the half words from the 32 bit word */    Xuint16 LoWord = (Xuint16)(Source & 0x0000FFFF);    Xuint16 HiWord = (Xuint16)((Source & 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 */    *DestPtr = (Xuint32)((LoWord << 16) | HiWord);}/*****************************************************************************//**** Performs an 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    InAddress contains the address to perform the input operation at.** @return** The byte-swapped value read from the specified input address.** @note** None.*******************************************************************************/Xuint16 XIo_InSwap16(XIo_Address InAddress){    Xuint16 InData;        /* get the data then swap it */    InData = XIo_In16(InAddress);        return (Xuint16)(((InData & 0xFF00) >> 8) | ((InData & 0x00FF) << 8));}/*****************************************************************************//**** Performs an 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    InAddress contains the address to perform the input operation at.** @return** The byte-swapped value read from the specified input address.** @note** None.*******************************************************************************/Xuint32 XIo_InSwap32(XIo_Address InAddress){    Xuint32 InData;    Xuint32 SwapData;        /* get the data then swap it */    InData = XIo_In32(InAddress);    XIo_EndianSwap32(InData, &SwapData);        return SwapData;}/*****************************************************************************//**** Performs an 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    OutAddress contains the address to perform the output operation at.* @param    Value contains the value to be output at the specified address.** @return** None.** @note** None.*******************************************************************************/void XIo_OutSwap16(XIo_Address OutAddress, Xuint16 Value){    Xuint16 OutData;        /* swap the data then output it */    OutData = (Xuint16)(((Value & 0xFF00) >> 8) | ((Value & 0x00FF) << 8));        XIo_Out16(OutAddress, OutData);}/*****************************************************************************//**** Performs an 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    OutAddress contains the address to perform the output operation at.* @param    Value contains the value to be output at the specified address.** @return** None.** @note** None.*******************************************************************************/void XIo_OutSwap32(XIo_Address OutAddress, Xuint32 Value){    Xuint32 OutData;        /* swap the data then output it */    XIo_EndianSwap32(Value, &OutData);    XIo_Out32(OutAddress, OutData);}